linux-kernel - Re: [PATCH 01/29] iov_iter: Switch to using a table of operations

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Date:   Fri, 27 Nov 2020 17:14:09 +0000
From:   David Howells <dhowells@...hat.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     dhowells@...hat.com, Pavel Begunkov <asml.silence@...il.com>,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/29] iov_iter: Switch to using a table of operations

Jens Axboe <axboe@...nel.dk> wrote:

> which looks to be around a 6% drop.

That's quite a lot.

> which looks to be around 2-3%, but we're also running at a much
> slower rate (830K vs ~2.3M).

That's still a lot.

Thanks for having a look!

David