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From: Pavel Begunkov <[email protected]>
To: Dmitry Kadashev <[email protected]>
Cc: Jens Axboe <[email protected]>, Josef <[email protected]>,
	Norman Maurer <[email protected]>,
	io-uring <[email protected]>
Subject: Re: "Cannot allocate memory" on ring creation (not RLIMIT_MEMLOCK)
Date: Wed, 23 Dec 2020 12:27:14 +0000	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAOKbgA4eihm=MyiVZSG03cxjks6=yw5eTr-dCBXmhQWmkK4YEg@mail.gmail.com>

On 23/12/2020 11:48, Dmitry Kadashev wrote:
> On Wed, Dec 23, 2020 at 4:38 PM Dmitry Kadashev <[email protected]> wrote:
>> Please ignore the results from the real box above (5.9.5). The memlock limit
>> interfered with this, since our app was running in the background and it had a
>> few rings running (most failed to be created, but not all). I'll try to make it
>> fully stuck and repeat the test with the app dead.
> 
> I've experimented with the 5.9 live boxes that were showing signs of the problem
> a bit more, and I'm not entirely sure they get stuck until reboot anymore.
> 
> I'm pretty sure it is the case with 5.6, but probably a bug was fixed since
> then - the fact that 5.8 in particular had quite a few fixes that seemed
> relevant is the reason we've tried 5.9 in the first place.
> 
> And on 5.9 we might be seeing fragmentation issues indeed. I shouldn't have been
> mixing my kernel versions :) Also, I did not realize a ring of size=1024
> requires 16 contiguous pages. We will experiment and observe a bit more, and
> meanwhile let's consider the case closed. If the issue surfaces again I'll
> update this thread.

If fragmentation is to blame, it's still a problem. Let us know if you find out
anything. And thanks for keeping debugging

-- 
Pavel Begunkov

  reply	other threads:[~2020-12-23 12:31 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-17  8:19 "Cannot allocate memory" on ring creation (not RLIMIT_MEMLOCK) Dmitry Kadashev
2020-12-17  8:26 ` Norman Maurer
2020-12-17  8:36   ` Dmitry Kadashev
2020-12-17  8:40     ` Dmitry Kadashev
2020-12-17 10:38       ` Josef
2020-12-17 11:10         ` Dmitry Kadashev
2020-12-17 13:43           ` Victor Stewart
2020-12-18  9:20             ` Dmitry Kadashev
2020-12-18 17:22               ` Jens Axboe
2020-12-18 15:26 ` Jens Axboe
2020-12-18 17:21   ` Josef
2020-12-18 17:23     ` Jens Axboe
2020-12-19  2:49       ` Josef
2020-12-19 16:13         ` Jens Axboe
2020-12-19 16:29           ` Jens Axboe
2020-12-19 17:11             ` Jens Axboe
2020-12-19 17:34               ` Norman Maurer
2020-12-19 17:38                 ` Jens Axboe
2020-12-19 20:51                   ` Josef
2020-12-19 21:54                     ` Jens Axboe
2020-12-19 23:13                       ` Jens Axboe
2020-12-19 23:42                         ` Josef
2020-12-19 23:42                         ` Pavel Begunkov
2020-12-20  0:25                           ` Jens Axboe
2020-12-20  0:55                             ` Pavel Begunkov
2020-12-21 10:35                               ` Dmitry Kadashev
2020-12-21 10:49                                 ` Dmitry Kadashev
2020-12-21 11:00                                 ` Dmitry Kadashev
2020-12-21 15:36                                   ` Pavel Begunkov
2020-12-22  3:35                                   ` Pavel Begunkov
2020-12-22  4:07                                     ` Pavel Begunkov
2020-12-22 11:04                                       ` Dmitry Kadashev
2020-12-22 11:06                                         ` Dmitry Kadashev
2020-12-22 13:13                                           ` Dmitry Kadashev
2020-12-22 16:33                                         ` Pavel Begunkov
2020-12-23  8:39                                           ` Dmitry Kadashev
2020-12-23  9:38                                             ` Dmitry Kadashev
2020-12-23 11:48                                               ` Dmitry Kadashev
2020-12-23 12:27                                                 ` Pavel Begunkov [this message]
2020-12-20  1:57                             ` Pavel Begunkov
2020-12-20  7:13                               ` Josef
2020-12-20 13:00                                 ` Pavel Begunkov
2020-12-20 14:19                                   ` Pavel Begunkov
2020-12-20 15:56                                     ` Josef
2020-12-20 15:58                                       ` Pavel Begunkov
2020-12-20 16:14                                   ` Jens Axboe
2020-12-20 16:59                                     ` Josef
2020-12-20 18:23                                       ` Josef
2020-12-20 18:41                                         ` Pavel Begunkov
2020-12-21  8:22                                           ` Josef
2020-12-21 15:30                                             ` Pavel Begunkov
2020-12-21 10:31               ` Dmitry Kadashev

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