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

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Message-ID: <Y1EHjbhS1wuw3qcr@infradead.org>
Date:   Thu, 20 Oct 2022 01:32:13 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Pavel Begunkov <asml.silence@...il.com>
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 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.