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From: Pavel Begunkov <asml.silence@gmail.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Jens Axboe <axboe@kernel.dk>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	linux-fsdevel@vger.kernel.org, io-uring@vger.kernel.org,
	linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
	Matthew Wilcox <willy@infradead.org>,
	Ming Lei <ming.lei@redhat.com>,
	Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: [RFC 0/2] nocopy bvec for direct IO
Date: Wed, 9 Dec 2020 11:54:01 +0000	[thread overview]
Message-ID: <8521bb81-ce0b-356f-ea75-bb069688715f@gmail.com> (raw)
In-Reply-To: <20201209065040.GA27959@infradead.org>

On 09/12/2020 06:50, Christoph Hellwig wrote:
> 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.  

The difference will go down with BS=~1-2 pages, just need to to find a
moment to test properly.

> But I only got this cover letter, not the
> actual patches..

Apologies, that goes for everyone as lost CCs in the patches.


-- 
Pavel Begunkov

  reply	other threads:[~2020-12-09 11:58 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-09  2:19 [RFC 0/2] nocopy bvec for direct IO Pavel Begunkov
2020-12-09  2:19 ` [PATCH 1/2] iov: introduce ITER_BVEC_FLAG_FIXED Pavel Begunkov
2020-12-09  8:36   ` Christoph Hellwig
2020-12-09  9:06     ` Christoph Hellwig
2020-12-09 11:54       ` Pavel Begunkov
2020-12-09 13:07     ` Al Viro
2020-12-09 13:37       ` Pavel Begunkov
2020-12-09 17:55         ` Christoph Hellwig
2020-12-09 18:24           ` Matthew Wilcox
2020-12-13 22:09             ` Pavel Begunkov
2020-12-09  2:19 ` [PATCH 2/2] block: no-copy bvec for direct IO Pavel Begunkov
2020-12-09  8:40   ` Christoph Hellwig
2020-12-09 12:01     ` Pavel Begunkov
2020-12-09 12:05       ` Christoph Hellwig
2020-12-09 12:03         ` Pavel Begunkov
2020-12-11 14:06     ` Johannes Weiner
2020-12-11 14:20       ` Pavel Begunkov
2020-12-11 15:38         ` Johannes Weiner
2020-12-11 15:47           ` Pavel Begunkov
2020-12-11 16:13             ` Johannes Weiner
2020-12-09 21:13   ` David Laight
2020-12-09  6:50 ` [RFC 0/2] nocopy " Christoph Hellwig
2020-12-09 11:54   ` Pavel Begunkov [this message]
2020-12-09 16:53 ` Jens Axboe
2020-12-13 22:03   ` Pavel Begunkov
2020-12-09 17:06 ` Al Viro

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