linux-kernel - Re: [RFC 0/2] nocopy bvec for direct IO

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Message-ID: <20201209065040.GA27959@infradead.org>
Date:   Wed, 9 Dec 2020 06:50:40 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Pavel Begunkov <asml.silence@...il.com>
Cc:     Jens Axboe <axboe@...nel.dk>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, io-uring@...r.kernel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>,
        Ming Lei <ming.lei@...hat.com>,
        Johannes Weiner <hannes@...xchg.org>
Subject: Re: [RFC 0/2] nocopy bvec for direct IO

On Wed, Dec 09, 2020 at 02:19:50AM +0000, Pavel Begunkov wrote:
> A benchmark got me 430KIOPS vs 540KIOPS, or +25% on bare metal. And perf
> shows that bio_iov_iter_get_pages() was taking ~20%. The test is pretty
> silly, but still imposing. I'll redo it closer to reality for next
> iteration, anyway need to double check some cases.

That is pretty impressive.  But I only got this cover letter, not the
actual patches..