lkml.org 
[lkml]   [2019]   [Dec]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH RFC v2 3/3] io_uring: batch get(ctx->ref) across submits
From
Date
On 21/12/2019 19:38, Jens Axboe wrote:
> On 12/21/19 9:20 AM, Pavel Begunkov wrote:
>> On 21/12/2019 19:15, Pavel Begunkov wrote:
>>> Double account ctx->refs keeping number of taken refs in ctx. As
>>> io_uring gets per-request ctx->refs during submission, while holding
>>> ctx->uring_lock, this allows in most of the time to bypass
>>> percpu_ref_get*() and its overhead.
>>
>> Jens, could you please benchmark with this one? Especially for offloaded QD1
>> case. I haven't got any difference for nops test and don't have a decent SSD
>> at hands to test it myself. We could drop it, if there is no benefit.
>>
>> This rewrites that @extra_refs from the second one, so I left it for now.
>
> Sure, let me run a peak test, qd1 test, qd1+sqpoll test on
> for-5.6/io_uring, same branch with 1-2, and same branch with 1-3. That
> should give us a good comparison. One core used for all, and we're going
> to be core speed bound for the performance in all cases on this setup.
> So it'll be a good comparison.
>
Great, thanks!

--
Pavel Begunkov

[unhandled content-type:application/pgp-signature]
\
 
 \ /
  Last update: 2019-12-21 17:49    [W:0.058 / U:10.064 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site