lkml.org 
[lkml]   [2012]   [Dec]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 00/26] AIO performance improvements/cleanups, v2
On Mon, Dec 03 2012, Kent Overstreet wrote:
> Last posting: http://thread.gmane.org/gmane.linux.kernel.aio.general/3169
>
> Changes since the last posting should all be noted in the individual
> patch descriptions.
>
> * Zach pointed out the aio_read_evt() patch was calling functions that
> could sleep in TASK_INTERRUPTIBLE state, that patch is rewritten.
> * Ben pointed out some synchronize_rcu() usage was problematic,
> converted it to call_rcu()
> * The flush_dcache_page() patch is new
> * Changed the "use cancellation list lazily" patch so as to remove
> ki_flags from struct kiocb.

Kent, I ran a few tests, and the below patches still don't seem as fast
as the approach I took. To keep it fair, I used your aio branch and
applied by dio speedups too. As a sanity check, I ran with your branch
alone as well. The quick results below - kaio is kent-aio, just your
branch. kaio-dio is with the direct IO speedups too. jaio is my branch,
which already has the dio changes too.

Devices Branch IOPS
1 kaio ~915K
1 kaio-dio ~930K
1 jaio ~1220K
6 kaio ~3050K
6 kaio-dio ~3080K
6 jaio 3500K

The box runs out of CPU driving power, which is why it doesn't scale
linearly, otherwise I know that jaio at least does. It's basically
completion limited for the 6 device test at the moment.

I'll run some profiling tomorrow morning and get you some better
results. Just thought I'd share these at least.

--
Jens Axboe



\
 
 \ /
  Last update: 2012-12-13 23:01    [W:0.169 / U:0.704 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site