From: Jens Axboe <[email protected]>
To: "Haeuptle, Michael" <[email protected]>,
"[email protected]" <[email protected]>
Subject: Re: Bug? CQE.res = -EAGAIN with nvme multipath driver
Date: Tue, 7 Jan 2025 11:26:37 -0700 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <IA1PR84MB310838E47FDAAFD543B8239A95112@IA1PR84MB3108.NAMPRD84.PROD.OUTLOOK.COM>
On 1/7/25 11:24 AM, Haeuptle, Michael wrote:
> Thanks for the quick response!
>
> When I remove that check on the 6.1.85 kernel version we're using,
> then it seems that the user space program is losing IOs. I confirmed
> this with fio. When we hit this issue, fio never completes and is
> stuck.
That's because the io_uring logic assumes it happens inline via
submission, and for your case it does not. Which is also why it gets
failed. And hence setting the retry flag in that condition will do
absolutely nothing, as nobody is there to see it.
> I can certainly try that later kernel with your fix, if you think
> there are other changes that prevent losing IOs.
Please try the branch and see how it fares for you.
--
Jens Axboe
next prev parent reply other threads:[~2025-01-07 18:26 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-01-06 20:03 Bug? CQE.res = -EAGAIN with nvme multipath driver Haeuptle, Michael
2025-01-06 23:53 ` Jens Axboe
2025-01-07 2:33 ` Jens Axboe
2025-01-07 2:39 ` Jens Axboe
2025-01-07 18:12 ` Jens Axboe
2025-01-07 18:24 ` Haeuptle, Michael
2025-01-07 18:26 ` Jens Axboe [this message]
2025-01-09 18:09 ` Haeuptle, Michael
2025-01-10 14:53 ` Jens Axboe
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