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

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Date:   Tue, 18 Oct 2022 20:33:59 +0100
From:   Pavel Begunkov <asml.silence@...il.com>
To:     Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org
Cc:     io-uring@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: [RFC for-next 0/4] enable pcpu bio caching for IRQ I/O

On 10/18/22 19:47, 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.

Ooops, wrong version, will resend


> t/io_uring with an Optane SSD setup showed +7% for batches of 32 requests
> and +4.3% for batches of 8.
> 
> IRQ, 128/32/32, cache off
> IOPS=59.08M, BW=28.84GiB/s, IOS/call=31/31
> IOPS=59.30M, BW=28.96GiB/s, IOS/call=32/32
> IOPS=59.97M, BW=29.28GiB/s, IOS/call=31/31
> IOPS=59.92M, BW=29.26GiB/s, IOS/call=32/32
> IOPS=59.81M, BW=29.20GiB/s, IOS/call=32/31
> 
> IRQ, 128/32/32, cache on
> IOPS=64.05M, BW=31.27GiB/s, IOS/call=32/31
> IOPS=64.22M, BW=31.36GiB/s, IOS/call=32/32
> IOPS=64.04M, BW=31.27GiB/s, IOS/call=31/31
> IOPS=63.16M, BW=30.84GiB/s, IOS/call=32/32
> 
> IRQ, 32/8/8, cache off
> IOPS=50.60M, BW=24.71GiB/s, IOS/call=7/8
> IOPS=50.22M, BW=24.52GiB/s, IOS/call=8/7
> IOPS=49.54M, BW=24.19GiB/s, IOS/call=8/8
> IOPS=50.07M, BW=24.45GiB/s, IOS/call=7/7
> IOPS=50.46M, BW=24.64GiB/s, IOS/call=8/8
> 
> IRQ, 32/8/8, cache on
> IOPS=51.39M, BW=25.09GiB/s, IOS/call=8/7
> IOPS=52.52M, BW=25.64GiB/s, IOS/call=7/8
> IOPS=52.57M, BW=25.67GiB/s, IOS/call=8/8
> IOPS=52.58M, BW=25.67GiB/s, IOS/call=8/7
> IOPS=52.61M, BW=25.69GiB/s, IOS/call=8/8
> 
> The main part is in patch 3. Would be great to take patch 1 separately
> for 6.1 for extra safety.
> 
> Pavel Begunkov (4):
>    bio: safeguard REQ_ALLOC_CACHE bio put
>    bio: split pcpu cache part of bio_put into a helper
>    block/bio: add pcpu caching for non-polling bio_put
>    io_uring/rw: enable bio caches for IRQ rw
> 
>   block/bio.c   | 92 +++++++++++++++++++++++++++++++++++++++------------
>   io_uring/rw.c |  3 +-
>   2 files changed, 73 insertions(+), 22 deletions(-)
> 

-- 
Pavel Begunkov