"Michael S. Tsirkin" <mst@xxxxxxxxxx> wrote on 05/05/2011 02:34:39 PM:
> > Do I need to apply all the patches and simply test?
> >
> > Thanks,
> >
> > - KK
>
> Exactly. You can also try to tune the threshold
> for interrupts as well.
I haven't tuned the threshhold, it is left it at 3/4. I ran
the new qemu/vhost/guest, and the results for 1K, 2K and 16K
are below. Note this is a different kernel version from my
earlier test results. So, f.e., BW1 represents 2.6.39-rc2,
the original kernel; while BW2 represents 2.6.37-rc5 (MST's
kernel). This also isn't with the fixes you have sent just
now. I will get a run with that either late tonight or
tomorrow.
________________________________________________________
I/O size: 1K
# BW1 BW2 (%) SD1 SD2 (%)
________________________________________________________
1 1723 3016 (75.0) 4.7 2.6 (-44.6)
2 3223 6712 (108.2) 18.0 7.1 (-60.5)
4 7223 8258 (14.3) 36.5 24.3 (-33.4)
8 8689 7943 (-8.5) 131.5 101.6 (-22.7)
16 8059 7398 (-8.2) 578.3 406.4 (-29.7)
32 7758 7208 (-7.0) 2281.4 1574.7 (-30.9)
64 7503 7155 (-4.6) 9734.0 6368.0 (-34.5)
96 7496 7078 (-5.5) 21980.9 15477.6 (-29.5)
128 7389 6900 (-6.6) 40467.5 26031.9 (-35.6)
________________________________________________________
Summary: BW: (4.4) SD: (-33.5)
________________________________________________________
I/O size: 2K
# BW1 BW2 (%) SD1 SD2 (%)
________________________________________________________
1 1608 4968 (208.9) 5.0 1.3 (-74.0)
2 3354 6974 (107.9) 18.6 4.9 (-73.6)
4 8234 8344 (1.3) 35.6 17.9 (-49.7)
8 8427 7818 (-7.2) 103.5 71.2 (-31.2)
16 7995 7491 (-6.3) 410.1 273.9 (-33.2)
32 7863 7149 (-9.0) 1678.6 1080.4 (-35.6)
64 7661 7092 (-7.4) 7245.3 4717.2 (-34.8)
96 7517 6984 (-7.0) 15711.2 9838.9 (-37.3)
128 7389 6851 (-7.2) 27121.6 18255.7 (-32.6)
________________________________________________________
Summary: BW: (6.0) SD: (-34.5)
________________________________________________________
I/O size: 16K
# BW1 BW2 (%) SD1 SD2 (%)
________________________________________________________
1 6684 7019 (5.0) 1.1 1.1 (0)
2 7674 7196 (-6.2) 5.0 4.8 (-4.0)
4 7358 8032 (9.1) 21.3 20.4 (-4.2)
8 7393 8015 (8.4) 82.7 82.0 (-.8)
16 7958 8366 (5.1) 283.2 310.7 (9.7)
32 7792 8113 (4.1) 1257.5 1363.0 (8.3)
64 7673 8040 (4.7) 5723.1 5812.4 (1.5)
96 7462 7883 (5.6) 12731.8 12119.8 (-4.8)
128 7338 7800 (6.2) 21331.7 21094.7 (-1.1)
________________________________________________________
Summary: BW: (4.6) SD: (-1.5)
Thanks,
- KK
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