linux-kernel - Re: [RFC for-next v2 0/4] enable pcpu bio caching for IRQ I/O

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Message-ID: <dd22bf6a-8620-49c1-ec27-195e39cb4c33@gmail.com>
Date:   Thu, 20 Oct 2022 13:40:19 +0100
From:   Pavel Begunkov <asml.silence@...il.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        io-uring@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: [RFC for-next v2 0/4] enable pcpu bio caching for IRQ I/O

On 10/20/22 09:32, Christoph Hellwig wrote:
> On Tue, Oct 18, 2022 at 08:50:54PM +0100, Pavel Begunkov wrote:
>> This series implements bio pcpu caching for normal / IRQ-driven I/O
>> extending REQ_ALLOC_CACHE currently limited to iopoll. The allocation side
>> still only works from non-irq context, which is the reason it's not enabled
>> by default, but turning it on for other users (e.g. filesystems) is
>> as a matter of passing a flag.
>>
>> t/io_uring with an Optane SSD setup showed +7% for batches of 32 requests
>> and +4.3% for batches of 8.
> 
> This looks much nicer to me than the previous attempt exposing the bio
> internals to io_uring, thanks.

Yeah, I saw the one Jens posted before but I wanted this one to be more
generic, i.e. applicable not only to io_uring. Thanks for taking a look.

-- 
Pavel Begunkov