Re: (subset) [PATCH 00/11] remove aux CQE caches

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On 3/17/24 2:55 PM, Pavel Begunkov wrote:
> On 3/16/24 13:56, Ming Lei wrote:
>> On Sat, Mar 16, 2024 at 01:27:17PM +0000, Pavel Begunkov wrote:
>>> On 3/16/24 11:52, Ming Lei wrote:
>>>> On Fri, Mar 15, 2024 at 04:53:21PM -0600, Jens Axboe wrote:
>>
>> ...
>>
>>>> The following two error can be triggered with this patchset
>>>> when running some ublk stress test(io vs. deletion). And not see
>>>> such failures after reverting the 11 patches.
>>>
>>> I suppose it's with the fix from yesterday. How can I
>>> reproduce it, blktests?
>>
>> Yeah, it needs yesterday's fix.
>>
>> You may need to run this test multiple times for triggering the problem:
> 
> Thanks for all the testing. I've tried it, all ublk/generic tests hang
> in userspace waiting for CQEs but no complaints from the kernel.
> However, it seems the branch is buggy even without my patches, I
> consistently (5-15 minutes of running in a slow VM) hit page underflow
> by running liburing tests. Not sure what is that yet, but might also
> be the reason.

Hmm odd, there's nothing in there but your series and then the
io_uring-6.9 bits pulled in. Maybe it hit an unfortunate point in the
merge window -git cycle? Does it happen with io_uring-6.9 as well? I
haven't seen anything odd.

> I'll repost it with the locking fix for reference, would make more
> sense retesting ublk after figuring out what's up with the branch.

Yep if you repost it with the fix, I'll rebase for-6.10/io_uring.

-- 
Jens Axboe





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