As part of HP's Open Source and Linux Organization's Performance and
Scalability Group, I've noticed what looks to be a regression in U320
SCSI performance coming down the pike. Background: These measurements
were performed on Red Hat RHEL4 update 2 (2.6.9-based) and a "generic"
2.6.14-based kernel; I used an HP RX4640 with 4 dual-U320 LSI Logic /
Symbios Logic 53c1030 PCI-X Fusion-MPT Dual Ultra320 SCSI (rev 08)
adapters, each with two buses containing 5 72GB/15k U320 drives (for a
total of 40 drives). The runs were done in single-user mode (to minimize
effects from other tasks), and report results in megabytes per second. I
ran tests for various block sized IOs (1KB, 2KB, 4, ...256KB per IO).
While trying to gage other things, I ran across this set of strange
phenomena on single-disk IOs (meaning: tests run one at a time on an
individual disk):
Read averages:
BS(KB) RHEL4U2 2.6.14 %-diff
------ -------- -------- ------
1 23.8 12.3 -48.4%
2 46.6 21.3 -54.2%
4 87.5 44.0 -49.7%
8 89.9 51.8 -42.4%
16 89.9 74.2 -17.4%
32 89.9 89.9 0.0%
64 89.9 89.9 0.0%
128 89.9 89.9 0.0%
256 89.9 89.8 -0.1%
For reads, we see a huge average drop for block sizes up to 32KB.
Write averages:
BS(KB) RHEL4U2 2.6.14 %-diff
------ -------- -------- ------
1 3.6 3.6 -0.2%
2 8.2 8.1 -1.3%
4 19.7 19.0 -3.2%
8 52.6 49.7 -5.5%
16 84.8 78.3 -7.6%
32 84.7 78.8 -7.0%
64 84.8 79.9 -5.8%
128 84.6 81.8 -3.3%
256 84.7 82.0 -3.1%
For writes, an across the board smaller decrease in average performance.
The real kicker though came out when I show individual disk results:
Going back to the read cases: Here are a couple of (representative)
drives - all the data is added as an attachment - I see some drives with
monstrously large performance reductions like:
(0,1) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.8 46.8 87.8 89.6 89.5 89.6 89.5 89.5 89.5
2.6.14 3.9 7.8 15.6 31.2 62.5 89.6 89.5 89.5 89.6
Differ -83.6% -83.3% -82.2% -65.2% -30.2% 0.0% 0.0% 0.0% 0.0%
(0,1) means target 1 on bus 0, and then the columns represent different
transfer sizes (1K up to 256K). I also see some that show little if any
difference:
(6,4) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.9 46.9 88.5 90.0 89.9 89.9 89.9 90.0 89.9
2.6.14.2 24.1 47.0 88.5 90.0 89.9 90.0 89.9 89.9 89.9
Differ 0.8% 0.2% 0.0% 0.0% 0.0% 0.1% 0.0% -0.1% 0.0%
(Which tends to explain the average being "only" about 50% as listed in
the first table.) And there are other drives which show some unchanged,
and some changed results:
(3,1) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.8 46.1 86.6 91.2 91.2 91.2 91.2 91.2 91.2
2.6.14.2 23.9 46.3 66.9 31.2 91.2 91.2 91.2 91.2 91.2
Differ 0.4% 0.4% -22.7% -65.8% 0.0% 0.0% 0.0% 0.0% 0.0%
(3,2) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.6 46.0 86.1 89.8 89.7 89.8 89.8 89.8 89.8
2.6.14.2 23.8 46.2 15.6 89.8 62.5 89.8 89.8 89.8 89.3
Differ 0.8% 0.4% -81.9% 0.0% -30.3% 0.0% 0.0% 0.0% -0.6%
One thing I will point out: while I haven't looked to see if the same
drivers consistently show similar issues, I have done multiple runs with
the same characteristics noted in the averages -- meaning, it's not
single run peculiarities in the general sense. [Next I am going to see
if I can match drives from run-to-run to see if the same ones exhibit
"bad" read regressions, or whether that moves around... I am also going
to check out runs on straight 2.6.9 (instead of using Red Hat's kernel...)]
For the write case, the drives exhibited similar differences, but on a
much smaller scale - here are some examples:
(0,4) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.2 19.6 54.7 86.2 85.9 86.0 85.9 85.9
2.6.14.2 3.5 8.1 19.0 52.0 79.5 80.0 80.9 83.1 83.4
Differ -2.8% -1.2% -3.1% -4.9% -7.8% -6.9% -5.9% -3.3% -2.9%
(0,5) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.1 19.5 53.5 86.8 86.7 86.7 86.3 86.7
2.6.14.2 3.6 8.1 19.0 51.1 79.8 80.5 81.3 83.0 83.9
Differ 0.0% 0.0% -2.6% -4.5% -8.1% -7.2% -6.2% -3.8% -3.2%
(1,1) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.2 19.6 55.0 86.7 87.3 87.1 87.0 86.8
2.6.14.2 3.5 8.1 19.0 52.0 80.2 80.9 82.7 84.0 84.0
Differ -2.8% -1.2% -3.1% -5.5% -7.5% -7.3% -5.1% -3.4% -3.2%
(1,2) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.1 19.5 53.6 86.2 86.1 85.9 86.1 86.5
2.6.14.2 3.6 8.1 19.0 51.1 78.9 80.0 82.0 83.1 83.3
Differ 0.0% 0.0% -2.6% -4.7% -8.5% -7.1% -4.5% -3.5% -3.7%
So, the natural question - has anybody else noted such things? Any ideas
as to why?
Thanks,
Alan D. Brunelle
Read averages:
BS(KB) RHEL4U2 2.6.14.2 %-diff
------ -------- -------- ------
1 23.8 12.3 -48.4%
2 46.6 21.3 -54.2%
4 87.5 44.0 -49.7%
8 89.9 51.8 -42.4%
16 89.9 74.2 -17.4%
32 89.9 89.9 0.0%
64 89.9 89.9 0.0%
128 89.9 89.9 0.0%
256 89.9 89.8 -0.1%
Write averages:
BS(KB) RHEL4U2 2.6.14.2 %-diff
------ -------- -------- ------
1 3.6 3.6 -0.2%
2 8.2 8.1 -1.3%
4 19.7 19.0 -3.2%
8 52.6 49.7 -5.5%
16 84.8 78.3 -7.6%
32 84.7 78.8 -7.0%
64 84.8 79.9 -5.8%
128 84.6 81.8 -3.3%
256 84.7 82.0 -3.1%
-------------------------------
Read data:
(0,1) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.8 46.8 87.8 89.6 89.5 89.6 89.5 89.5 89.5
2.6.14.2 3.9 7.8 15.6 31.2 62.5 89.6 89.5 89.5 89.6
Differ -83.6% -83.3% -82.2% -65.2% -30.2% 0.0% 0.0% 0.0% 0.1%
(0,2) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.8 46.9 87.6 89.7 89.7 89.7 89.7 89.7 89.7
2.6.14.2 3.9 7.8 15.6 31.3 62.5 89.7 89.7 89.7 89.7
Differ -83.6% -83.4% -82.2% -65.1% -30.3% 0.0% 0.0% 0.0% 0.0%
(0,3) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.8 46.8 88.5 89.6 89.7 89.6 89.6 89.7 89.6
2.6.14.2 3.9 7.8 15.6 31.2 62.5 89.7 89.6 89.7 89.3
Differ -83.6% -83.3% -82.4% -65.2% -30.3% 0.1% 0.0% 0.0% -0.3%
(0,4) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.8 46.8 88.6 89.6 89.6 89.5 89.6 89.6 89.6
2.6.14.2 3.9 7.8 15.6 31.2 62.5 89.6 89.6 89.6 89.6
Differ -83.6% -83.3% -82.4% -65.2% -30.2% 0.1% 0.0% 0.0% 0.0%
(0,5) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.8 46.8 88.3 89.7 89.6 89.7 89.6 89.6 89.6
2.6.14.2 3.9 7.8 15.6 31.2 61.7 89.7 89.6 89.6 89.5
Differ -83.6% -83.3% -82.3% -65.2% -31.1% 0.0% 0.0% 0.0% -0.1%
(1,1) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.8 46.8 88.3 89.6 89.6 89.7 89.6 89.6 89.6
2.6.14.2 3.9 7.8 16.5 31.2 66.8 89.7 89.6 89.6 89.7
Differ -83.6% -83.3% -81.3% -65.2% -25.4% 0.0% 0.0% 0.0% 0.1%
(1,2) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.9 46.8 88.3 90.0 89.9 90.0 89.9 90.0 89.9
2.6.14.2 24.0 7.8 15.6 31.2 62.5 89.6 90.0 90.0 89.9
Differ 0.4% -83.3% -82.3% -65.3% -30.5% -0.4% 0.1% 0.0% 0.0%
(1,3) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.9 46.8 87.9 90.4 90.4 90.3 90.3 90.3 90.4
2.6.14.2 3.9 7.8 15.6 31.2 62.5 89.9 90.3 90.3 90.2
Differ -83.7% -83.3% -82.3% -65.5% -30.9% -0.4% 0.0% 0.0% -0.2%
(1,4) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.8 46.8 88.5 89.9 89.8 89.8 89.8 89.9 89.8
2.6.14.2 3.9 7.8 15.6 31.2 62.5 89.9 89.8 89.8 89.7
Differ -83.6% -83.3% -82.4% -65.3% -30.4% 0.1% 0.0% -0.1% -0.1%
(1,5) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.8 46.8 87.7 89.9 89.8 89.8 89.9 89.8 89.8
2.6.14.2 3.9 7.8 15.6 31.3 61.4 89.8 89.8 89.8 89.8
Differ -83.6% -83.3% -82.2% -65.2% -31.6% 0.0% -0.1% 0.0% 0.0%
(2,1) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.8 46.8 88.6 89.7 89.7 89.8 89.8 89.8 89.8
2.6.14.2 3.9 16.7 88.8 31.2 89.7 89.7 89.7 89.7 89.8
Differ -83.6% -64.3% 0.2% -65.2% 0.0% -0.1% -0.1% -0.1% 0.0%
(2,2) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.9 46.9 88.4 90.0 89.9 89.9 89.9 89.9 89.9
2.6.14.2 3.9 10.6 88.5 89.9 89.9 90.0 90.0 90.0 90.0
Differ -83.7% -77.4% 0.1% -0.1% 0.0% 0.1% 0.1% 0.1% 0.1%
(2,3) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.8 46.9 88.1 90.2 90.3 90.2 90.2 90.2 90.2
2.6.14.2 3.9 29.0 88.1 90.3 90.3 90.3 90.2 90.2 90.2
Differ -83.6% -38.2% 0.0% 0.1% 0.0% 0.1% 0.0% 0.0% 0.0%
(2,4) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.9 46.8 87.8 89.9 89.8 89.9 89.8 89.8 89.8
2.6.14.2 3.9 47.0 88.0 89.9 89.8 89.9 89.9 89.8 89.7
Differ -83.7% 0.4% 0.2% 0.0% 0.0% 0.0% 0.1% 0.0% -0.1%
(2,5) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.8 46.8 87.9 89.9 90.0 90.0 89.9 90.0 90.0
2.6.14.2 24.0 11.5 87.9 90.0 89.9 90.0 89.9 89.9 89.9
Differ 0.8% -75.4% 0.0% 0.1% -0.1% 0.0% 0.0% -0.1% -0.1%
(3,1) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.8 46.1 86.6 91.2 91.2 91.2 91.2 91.2 91.2
2.6.14.2 23.9 46.3 66.9 31.2 91.2 91.2 91.2 91.2 91.2
Differ 0.4% 0.4% -22.7% -65.8% 0.0% 0.0% 0.0% 0.0% 0.0%
(3,2) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.6 46.0 86.1 89.8 89.7 89.8 89.8 89.8 89.8
2.6.14.2 23.8 46.2 15.6 89.8 62.5 89.8 89.8 89.8 89.3
Differ 0.8% 0.4% -81.9% 0.0% -30.3% 0.0% 0.0% 0.0% -0.6%
(3,3) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.6 46.0 86.0 89.7 89.7 89.7 89.7 89.7 89.7
2.6.14.2 23.7 46.2 86.2 31.2 89.7 89.7 89.7 89.7 89.3
Differ 0.4% 0.4% 0.2% -65.2% 0.0% 0.0% 0.0% 0.0% -0.4%
(3,4) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.6 46.0 86.5 89.9 89.9 89.9 90.0 90.0 89.9
2.6.14.2 23.8 46.2 15.6 90.0 62.5 90.0 89.9 89.9 90.0
Differ 0.8% 0.4% -82.0% 0.1% -30.5% 0.1% -0.1% -0.1% 0.1%
(3,5) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.6 46.0 85.9 89.9 89.9 89.9 89.9 89.9 89.9
2.6.14.2 23.7 46.1 86.2 89.9 89.9 89.6 90.0 89.9 89.8
Differ 0.4% 0.2% 0.3% 0.0% 0.0% -0.3% 0.1% 0.0% -0.1%
(4,1) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.9 46.9 87.7 89.6 89.5 89.6 89.6 89.5 89.6
2.6.14.2 3.9 7.8 15.6 31.2 62.5 89.2 89.6 89.5 89.6
Differ -83.7% -83.4% -82.2% -65.2% -30.2% -0.4% 0.0% 0.0% 0.0%
(4,2) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.9 46.9 88.2 89.5 89.5 89.5 89.5 89.5 89.6
2.6.14.2 3.9 7.8 15.6 31.2 62.5 89.6 89.5 89.6 89.5
Differ -83.7% -83.4% -82.3% -65.1% -30.2% 0.1% 0.0% 0.1% -0.1%
(4,3) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.9 46.9 88.8 90.9 90.8 90.9 90.8 90.9 90.9
2.6.14.2 3.9 7.8 15.6 31.2 62.5 90.9 90.9 90.9 90.6
Differ -83.7% -83.4% -82.4% -65.7% -31.2% 0.0% 0.1% 0.0% -0.3%
(4,4) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.9 46.9 88.6 89.7 89.6 89.7 89.6 89.6 89.7
2.6.14.2 3.9 7.8 15.6 31.2 62.5 89.7 89.6 89.6 89.6
Differ -83.7% -83.4% -82.4% -65.2% -30.2% 0.0% 0.0% 0.0% -0.1%
(4,5) 1 2 4 8 16 32 64 128 256
RHEL4U2 24.0 47.0 88.5 89.9 89.9 89.9 89.9 89.9 89.9
2.6.14.2 3.9 7.8 15.6 31.2 62.5 89.9 89.9 89.9 89.9
Differ -83.8% -83.4% -82.4% -65.3% -30.5% 0.0% 0.0% 0.0% 0.0%
(5,1) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.8 46.2 86.0 89.7 89.8 89.7 89.7 89.7 89.7
2.6.14.2 3.9 7.8 15.6 31.3 62.5 89.7 89.7 89.7 89.6
Differ -83.6% -83.1% -81.9% -65.1% -30.4% 0.0% 0.0% 0.0% -0.1%
(5,2) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.8 46.2 86.1 89.9 89.9 89.9 89.9 89.9 89.9
2.6.14.2 3.9 7.8 15.6 31.2 62.5 89.9 89.9 89.9 89.6
Differ -83.6% -83.1% -81.9% -65.3% -30.5% 0.0% 0.0% 0.0% -0.3%
(5,3) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.7 46.2 86.7 89.6 89.6 89.6 89.6 89.6 89.6
2.6.14.2 3.9 7.8 15.6 31.2 62.5 89.6 89.6 89.6 89.5
Differ -83.5% -83.1% -82.0% -65.2% -30.2% 0.0% 0.0% 0.0% -0.1%
(5,4) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.7 46.1 86.5 89.7 89.6 89.7 89.6 89.7 89.6
2.6.14.2 3.9 7.8 15.6 31.2 62.5 89.7 89.7 89.7 89.7
Differ -83.5% -83.1% -82.0% -65.2% -30.2% 0.0% 0.1% 0.0% 0.1%
(5,5) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.8 46.1 86.6 90.6 90.5 90.5 90.6 90.5 90.5
2.6.14.2 3.9 7.8 15.6 31.3 62.5 90.6 90.5 90.5 90.6
Differ -83.6% -83.1% -82.0% -65.5% -30.9% 0.1% -0.1% 0.0% 0.1%
(6,1) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.9 46.9 89.0 89.6 89.6 89.6 89.6 89.7 89.7
2.6.14.2 24.1 47.1 89.3 89.6 89.7 89.6 89.6 89.7 89.6
Differ 0.8% 0.4% 0.3% 0.0% 0.1% 0.0% 0.0% 0.0% -0.1%
(6,2) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.9 46.9 88.5 89.8 89.8 89.9 89.9 89.9 89.9
2.6.14.2 24.1 47.1 88.8 89.8 89.9 89.9 89.9 89.8 89.9
Differ 0.8% 0.4% 0.3% 0.0% 0.1% 0.0% 0.0% -0.1% 0.0%
(6,3) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.8 46.9 87.7 89.8 89.9 89.8 89.8 89.9 89.9
2.6.14.2 24.0 7.9 88.1 89.9 89.8 89.9 89.8 89.9 89.7
Differ 0.8% -83.2% 0.5% 0.1% -0.1% 0.1% 0.0% 0.0% -0.2%
(6,4) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.9 46.9 88.5 90.0 89.9 89.9 89.9 90.0 89.9
2.6.14.2 24.1 47.0 88.5 90.0 89.9 90.0 89.9 89.9 89.9
Differ 0.8% 0.2% 0.0% 0.0% 0.0% 0.1% 0.0% -0.1% 0.0%
(6,5) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.8 46.8 89.0 90.8 90.7 90.8 90.7 90.8 90.7
2.6.14.2 24.0 9.9 89.2 31.2 90.7 90.7 90.7 90.8 90.8
Differ 0.8% -78.8% 0.2% -65.6% 0.0% -0.1% 0.0% 0.0% 0.1%
(7,1) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.6 46.1 86.5 89.7 89.7 89.7 89.7 89.7 89.7
2.6.14.2 23.8 46.2 86.8 89.7 89.7 89.4 89.7 89.7 89.7
Differ 0.8% 0.2% 0.3% 0.0% 0.0% -0.3% 0.0% 0.0% 0.0%
(7,2) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.6 46.0 86.5 90.7 90.8 90.7 90.8 90.8 90.7
2.6.14.2 23.8 7.8 86.4 90.8 90.7 90.7 90.7 90.8 90.6
Differ 0.8% -83.0% -0.1% 0.1% -0.1% 0.0% -0.1% 0.0% -0.1%
(7,3) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.6 46.1 86.0 89.8 89.7 89.7 89.8 89.8 89.8
2.6.14.2 23.8 46.2 86.3 89.7 61.4 89.7 89.7 89.7 89.5
Differ 0.8% 0.2% 0.3% -0.1% -31.5% 0.0% -0.1% -0.1% -0.3%
(7,4) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.6 46.1 86.6 89.7 89.7 89.6 89.6 89.7 89.6
2.6.14.2 23.8 46.2 15.6 31.2 89.6 89.3 89.6 89.7 89.6
Differ 0.8% 0.2% -82.0% -65.2% -0.1% -0.3% 0.0% 0.0% 0.0%
(7,5) 1 2 4 8 16 32 64 128 256
RHEL4U2 23.6 46.0 86.5 89.6 89.6 89.6 89.6 89.6 89.6
2.6.14.2 18.9 46.2 15.6 31.2 89.6 89.6 89.6 89.6 89.6
Differ -19.9% 0.4% -82.0% -65.2% 0.0% 0.0% 0.0% 0.0% 0.0%
-------------------------------
Write data:
(0,1) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.5 8.1 19.8 52.5 81.1 81.0 81.6 81.2 82.2
2.6.14.2 3.5 8.1 19.2 50.2 75.7 75.9 77.0 79.0 78.8
Differ 0.0% 0.0% -3.0% -4.4% -6.7% -6.3% -5.6% -2.7% -4.1%
(0,2) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.2 20.1 53.4 85.9 86.2 86.4 86.2 86.1
2.6.14.2 3.5 8.1 19.3 51.2 79.8 80.6 81.5 83.4 83.3
Differ -2.8% -1.2% -4.0% -4.1% -7.1% -6.5% -5.7% -3.2% -3.3%
(0,3) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.2 19.5 54.7 85.5 85.7 85.9 85.9 85.2
2.6.14.2 3.5 8.1 18.9 52.3 78.9 79.3 80.5 82.7 82.7
Differ -2.8% -1.2% -3.1% -4.4% -7.7% -7.5% -6.3% -3.7% -2.9%
(0,4) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.2 19.6 54.7 86.2 85.9 86.0 85.9 85.9
2.6.14.2 3.5 8.1 19.0 52.0 79.5 80.0 80.9 83.1 83.4
Differ -2.8% -1.2% -3.1% -4.9% -7.8% -6.9% -5.9% -3.3% -2.9%
(0,5) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.1 19.5 53.5 86.8 86.7 86.7 86.3 86.7
2.6.14.2 3.6 8.1 19.0 51.1 79.8 80.5 81.3 83.0 83.9
Differ 0.0% 0.0% -2.6% -4.5% -8.1% -7.2% -6.2% -3.8% -3.2%
(1,1) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.2 19.6 55.0 86.7 87.3 87.1 87.0 86.8
2.6.14.2 3.5 8.1 19.0 52.0 80.2 80.9 82.7 84.0 84.0
Differ -2.8% -1.2% -3.1% -5.5% -7.5% -7.3% -5.1% -3.4% -3.2%
(1,2) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.1 19.5 53.6 86.2 86.1 85.9 86.1 86.5
2.6.14.2 3.6 8.1 19.0 51.1 78.9 80.0 82.0 83.1 83.3
Differ 0.0% 0.0% -2.6% -4.7% -8.5% -7.1% -4.5% -3.5% -3.7%
(1,3) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.2 20.0 52.8 83.3 83.5 83.6 82.6 83.2
2.6.14.2 3.6 8.1 19.4 50.2 75.0 78.0 79.5 81.0 80.9
Differ 0.0% -1.2% -3.0% -4.9% -10.0% -6.6% -4.9% -1.9% -2.8%
(1,4) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.2 19.6 54.8 86.0 85.8 85.5 86.1 85.4
2.6.14.2 3.6 8.1 19.0 51.9 78.6 79.8 81.4 82.6 82.5
Differ 0.0% -1.2% -3.1% -5.3% -8.6% -7.0% -4.8% -4.1% -3.4%
(1,5) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.2 20.1 53.9 87.3 87.1 87.3 86.9 87.0
2.6.14.2 3.6 7.7 19.3 51.5 77.4 80.8 83.1 84.1 84.3
Differ 0.0% -6.1% -4.0% -4.5% -11.3% -7.2% -4.8% -3.2% -3.1%
(2,1) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.2 19.6 52.6 86.5 86.4 86.8 85.9 86.0
2.6.14.2 3.6 8.1 19.0 49.0 80.5 80.0 80.9 83.4 83.4
Differ 0.0% -1.2% -3.1% -6.8% -6.9% -7.4% -6.8% -2.9% -3.0%
(2,2) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.1 19.3 53.1 84.9 84.6 84.8 85.0 84.4
2.6.14.2 3.6 8.1 19.0 50.7 78.0 79.6 79.3 81.5 82.4
Differ 0.0% 0.0% -1.6% -4.5% -8.1% -5.9% -6.5% -4.1% -2.4%
(2,3) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.2 19.9 50.3 85.4 85.6 85.1 85.7 85.3
2.6.14.2 3.6 8.1 19.2 47.9 79.0 79.4 80.5 82.3 82.3
Differ 0.0% -1.2% -3.5% -4.8% -7.5% -7.2% -5.4% -4.0% -3.5%
(2,4) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.2 19.9 51.0 86.9 86.7 86.6 86.7 86.2
2.6.14.2 3.6 8.1 19.1 48.5 80.3 80.3 81.4 83.8 83.9
Differ 0.0% -1.2% -4.0% -4.9% -7.6% -7.4% -6.0% -3.3% -2.7%
(2,5) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.1 19.8 50.2 84.1 84.1 84.5 83.5 83.4
2.6.14.2 3.5 8.1 19.0 47.6 77.8 78.2 79.3 81.7 81.4
Differ -2.8% 0.0% -4.0% -5.2% -7.5% -7.0% -6.2% -2.2% -2.4%
(3,1) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.2 19.9 49.7 86.7 87.0 87.0 86.2 87.1
2.6.14.2 3.6 8.1 19.1 46.4 80.7 81.1 81.0 83.5 83.7
Differ 0.0% -1.2% -4.0% -6.6% -6.9% -6.8% -6.9% -3.1% -3.9%
(3,2) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.2 19.9 51.3 86.6 86.2 86.6 87.1 86.6
2.6.14.2 3.5 8.1 19.1 48.3 80.7 80.6 80.7 83.4 83.8
Differ -2.8% -1.2% -4.0% -5.8% -6.8% -6.5% -6.8% -4.2% -3.2%
(3,3) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.1 19.9 51.2 85.1 85.4 85.4 84.9 85.0
2.6.14.2 3.5 8.1 19.1 48.2 79.0 79.4 79.4 82.2 82.5
Differ -2.8% 0.0% -4.0% -5.9% -7.2% -7.0% -7.0% -3.2% -2.9%
(3,4) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.2 19.6 51.1 87.8 87.4 87.3 87.6 87.5
2.6.14.2 3.6 8.1 19.0 47.9 81.3 81.3 81.6 84.4 84.7
Differ 0.0% -1.2% -3.1% -6.3% -7.4% -7.0% -6.5% -3.7% -3.2%
(3,5) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.2 19.9 50.6 85.8 85.9 86.0 86.1 85.6
2.6.14.2 3.6 8.1 19.2 48.1 79.8 79.8 80.4 82.7 83.4
Differ 0.0% -1.2% -3.5% -4.9% -7.0% -7.1% -6.5% -3.9% -2.6%
(4,1) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.2 19.9 52.5 87.1 86.4 87.1 86.9 86.8
2.6.14.2 3.5 8.1 19.2 49.2 80.7 80.4 82.1 84.0 83.9
Differ -2.8% -1.2% -3.5% -6.3% -7.3% -6.9% -5.7% -3.3% -3.3%
(4,2) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.1 19.3 53.5 86.9 87.1 86.6 86.7 86.8
2.6.14.2 3.6 8.1 18.9 51.0 80.2 80.6 81.9 84.0 83.9
Differ 0.0% 0.0% -2.1% -4.7% -7.7% -7.5% -5.4% -3.1% -3.3%
(4,3) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.1 19.5 50.2 83.7 83.9 83.7 83.7 83.8
2.6.14.2 3.5 8.0 18.9 48.1 78.1 77.9 79.6 81.4 81.5
Differ -2.8% -1.2% -3.1% -4.2% -6.7% -7.2% -4.9% -2.7% -2.7%
(4,4) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.2 19.4 52.9 84.9 84.6 85.4 84.6 84.9
2.6.14.2 3.5 8.1 18.8 48.6 78.7 79.0 79.6 81.8 82.0
Differ -2.8% -1.2% -3.1% -8.1% -7.3% -6.6% -6.8% -3.3% -3.4%
(4,5) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.1 19.4 52.8 84.4 84.3 84.8 84.3 84.1
2.6.14.2 3.6 8.1 18.9 50.3 78.5 78.4 79.3 80.9 82.2
Differ 0.0% 0.0% -2.6% -4.7% -7.0% -7.0% -6.5% -4.0% -2.3%
(5,1) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.5 8.1 19.7 50.9 81.4 81.8 81.6 81.3 81.1
2.6.14.2 3.5 7.9 18.8 47.6 74.9 74.8 76.7 77.9 77.2
Differ 0.0% -2.5% -4.6% -6.5% -8.0% -8.6% -6.0% -4.2% -4.8%
(5,2) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.1 19.8 51.2 82.5 83.1 82.6 82.8 82.4
2.6.14.2 3.5 8.0 18.9 47.7 76.8 77.4 79.1 80.4 80.7
Differ -2.8% -1.2% -4.5% -6.8% -6.9% -6.9% -4.2% -2.9% -2.1%
(5,3) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.2 19.5 53.8 86.0 86.0 86.5 85.8 86.2
2.6.14.2 3.5 7.8 19.0 49.7 78.8 80.2 81.5 83.1 83.4
Differ -2.8% -4.9% -2.6% -7.6% -8.4% -6.7% -5.8% -3.1% -3.2%
(5,4) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.5 8.1 19.3 51.8 79.1 79.0 78.6 78.7 79.2
2.6.14.2 3.5 7.9 18.6 47.1 72.9 74.1 76.2 77.0 77.3
Differ 0.0% -2.5% -3.6% -9.1% -7.8% -6.2% -3.1% -2.2% -2.4%
(5,5) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.2 19.6 51.2 82.5 82.8 82.7 82.1 82.3
2.6.14.2 3.6 8.0 18.9 46.2 76.0 77.0 79.0 79.9 80.2
Differ 0.0% -2.4% -3.6% -9.8% -7.9% -7.0% -4.5% -2.7% -2.6%
(6,1) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.5 8.2 19.4 55.5 80.0 80.2 80.4 79.8 80.3
2.6.14.2 3.5 8.1 18.8 52.3 75.1 74.7 75.7 77.5 77.6
Differ 0.0% -1.2% -3.1% -5.8% -6.1% -6.9% -5.8% -2.9% -3.4%
(6,2) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.2 19.3 53.4 80.7 80.1 80.3 80.2 80.0
2.6.14.2 3.6 8.1 18.9 50.5 74.6 75.1 76.3 77.9 77.9
Differ 0.0% -1.2% -2.1% -5.4% -7.6% -6.2% -5.0% -2.9% -2.6%
(6,3) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.2 20.1 53.5 86.0 85.6 86.5 86.1 86.3
2.6.14.2 3.6 8.1 19.4 51.1 79.4 80.3 80.7 82.9 83.3
Differ 0.0% -1.2% -3.5% -4.5% -7.7% -6.2% -6.7% -3.7% -3.5%
(6,4) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.1 19.5 53.6 85.8 85.7 86.2 84.3 84.9
2.6.14.2 3.6 8.1 19.0 51.1 78.8 78.5 79.7 80.0 81.7
Differ 0.0% 0.0% -2.6% -4.7% -8.2% -8.4% -7.5% -5.1% -3.8%
(6,5) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.2 19.6 50.5 78.1 78.4 78.0 78.1 78.3
2.6.14.2 3.5 8.0 18.9 48.3 72.5 72.9 74.5 75.7 77.3
Differ -2.8% -2.4% -3.6% -4.4% -7.2% -7.0% -4.5% -3.1% -1.3%
(7,1) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.1 19.5 53.6 86.6 86.6 86.4 86.5 86.7
2.6.14.2 3.6 8.1 18.9 50.7 80.2 80.2 81.0 83.7 83.8
Differ 0.0% 0.0% -3.1% -5.4% -7.4% -7.4% -6.3% -3.2% -3.3%
(7,2) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.2 20.0 51.9 86.6 86.4 87.0 86.9 86.9
2.6.14.2 3.6 8.1 19.2 49.7 80.4 80.9 81.3 84.2 83.8
Differ 0.0% -1.2% -4.0% -4.2% -7.2% -6.4% -6.6% -3.1% -3.6%
(7,3) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.1 19.9 52.7 82.3 82.7 82.5 82.5 82.3
2.6.14.2 3.5 8.1 19.3 50.3 76.8 76.4 78.1 79.7 80.2
Differ -2.8% 0.0% -3.0% -4.6% -6.7% -7.6% -5.3% -3.4% -2.6%
(7,4) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.2 19.5 54.6 86.1 86.4 86.1 86.1 86.3
2.6.14.2 3.5 8.1 18.9 52.1 79.8 80.1 80.6 83.5 83.1
Differ -2.8% -1.2% -3.1% -4.6% -7.3% -7.3% -6.4% -3.0% -3.7%
(7,5) 1 2 4 8 16 32 64 128 256
RHEL4U2 3.6 8.2 19.5 54.6 84.6 84.4 84.9 84.2 84.2
2.6.14.2 3.6 8.1 18.9 51.9 78.3 78.3 78.9 81.6 81.7
Differ 0.0% -1.2% -3.1% -4.9% -7.4% -7.2% -7.1% -3.1% -3.0%
