Hi Seth,
On Mon, Jul 15, 2013 at 10:56 PM, Seth Jennings
<sjenning@xxxxxxxxxxxxxxxxxx> wrote:
> On Mon, Jul 15, 2013 at 10:56:17AM +0800, Bob Liu wrote:
>> As my test results showed in this thread.
>> 1. Zswap only useful when total ram size is large else the performance
>> was worse than disabled it!
>
> I have not observed this. In my kernbench runs, I was using VMs with ~512MB
> of RAM and saw significant improvement from zswap.
>
Could you confirm the results? Since zswap changed a lot from the beginning.
I tried with 1G of RAM based on kernel v3.10 with you zswap patches,
but there isn't performance improvement.
I have no idea what's the problem might be.
Using make -j4:
kernbench
base1 frontswa
base1G frontswap
User min 1025.27 ( 0.00%) 1024.79 ( 0.05%)
User mean 1025.27 ( 0.00%) 1024.79 ( 0.05%)
User stddev 0.00 ( 0.00%) 0.00 ( 0.00%)
User max 1025.27 ( 0.00%) 1024.79 ( 0.05%)
System min 52.07 ( 0.00%) 52.56 ( -0.94%)
System mean 52.07 ( 0.00%) 52.56 ( -0.94%)
System stddev 0.00 ( 0.00%) 0.00 ( 0.00%)
System max 52.07 ( 0.00%) 52.56 ( -0.94%)
Elapsed min 374.21 ( 0.00%) 370.52 ( 0.99%)
Elapsed mean 374.21 ( 0.00%) 370.52 ( 0.99%)
Elapsed stddev 0.00 ( 0.00%) 0.00 ( 0.00%)
Elapsed max 374.21 ( 0.00%) 370.52 ( 0.99%)
CPU min 287.00 ( 0.00%) 290.00 ( -1.05%)
CPU mean 287.00 ( 0.00%) 290.00 ( -1.05%)
CPU stddev 0.00 ( 0.00%) 0.00 ( 0.00%)
CPU max 287.00 ( 0.00%) 290.00 ( -1.05%)
base1 frontswa
base1G frontswap
User 1027.02 1026.44
System 52.90 53.49
Elapsed 401.51 404.19
base1 frontswa
base1G frontswap
Page Ins 1526804 1531812
Page Outs 2230280 2229688
Swap Ins 440 0
Swap Outs 2743 2
---------------------------------------------
You can see that the swapins/swapouts reduced significantly. But the
run time didn't reduced accordingly.
The same result by using make -j16:
kernbench
base1 frontsw1
base16 frontsw16
User min 1071.42 ( 0.00%) 1067.70 ( 0.35%)
User mean 1071.42 ( 0.00%) 1067.70 ( 0.35%)
User stddev 0.00 ( 0.00%) 0.00 ( 0.00%)
User max 1071.42 ( 0.00%) 1067.70 ( 0.35%)
System min 56.29 ( 0.00%) 57.06 ( -1.37%)
System mean 56.29 ( 0.00%) 57.06 ( -1.37%)
System stddev 0.00 ( 0.00%) 0.00 ( 0.00%)
System max 56.29 ( 0.00%) 57.06 ( -1.37%)
Elapsed min 360.41 ( 0.00%) 357.24 ( 0.88%)
Elapsed mean 360.41 ( 0.00%) 357.24 ( 0.88%)
Elapsed stddev 0.00 ( 0.00%) 0.00 ( 0.00%)
Elapsed max 360.41 ( 0.00%) 357.24 ( 0.88%)
CPU min 312.00 ( 0.00%) 314.00 ( -0.64%)
CPU mean 312.00 ( 0.00%) 314.00 ( -0.64%)
CPU stddev 0.00 ( 0.00%) 0.00 ( 0.00%)
CPU max 312.00 ( 0.00%) 314.00 ( -0.64%)
base1 frontsw1
base16 frontsw16
User 1073.24 1069.44
System 57.14 57.91
Elapsed 387.61 389.91
base1 frontsw1
base16 frontsw16
Page Ins 1783848 1774536
Page Outs 2241616 2238868
Swap Ins 612 22
Swap Outs 2569 40
--
Regards,
--Bob
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxx. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>