From: Christoph Hellwig <hch@infradead.org>
To: Stefan Hajnoczi <stefanha@gmail.com>
Cc: Minchan Kim <minchan@kernel.org>,
Rusty Russell <rusty@rustcorp.com.au>,
Chris Wright <chrisw@sous-sol.org>, Jens Axboe <axboe@kernel.dk>,
Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Christoph Hellwig <hch@infradead.org>,
Vivek Goyal <vgoyal@redhat.com>
Subject: Re: [PATCH 0/6][RFC] virtio-blk: Change I/O path from request to BIO
Date: Mon, 2 Jan 2012 11:18:03 -0500 [thread overview]
Message-ID: <20120102161803.GA32365@infradead.org> (raw)
In-Reply-To: <CAJSP0QWpzOGtQEULu7yz1vDEExSatGpdEPSvvDx=oNYkBveyrQ@mail.gmail.com>
On Sun, Jan 01, 2012 at 04:45:42PM +0000, Stefan Hajnoczi wrote:
> win. The fact that you added batching suggests there is some benefit
> to what the request-based code path does. So find out what's good
> about the request-based code path and how to get the best of both
> worlds.
Batching pretty much always is a winner. The maximum bio size is small
enough that we'll frequently see multiple contiguos bios. Because of
that the Md layer fo example uses the same kind of batching. I've tried
to make this more general by passing a bio list to ->make_request and
make the on-stack plugging work on bios, but in the timeslice I had
available for that I didn't manage to actually make it work.
next prev parent reply other threads:[~2012-01-02 16:18 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-21 1:00 [PATCH 0/6][RFC] virtio-blk: Change I/O path from request to BIO Minchan Kim
2011-12-21 1:00 ` [PATCH 1/6] block: add bio_map_sg Minchan Kim
2011-12-21 1:00 ` [PATCH 2/6] virtio: support unlocked queue kick Minchan Kim
2011-12-21 1:00 ` [PATCH 3/6] virtio-blk: remove the unused list of pending requests Minchan Kim
2011-12-21 1:00 ` [PATCH 4/6] virtio-blk: implement ->make_request Minchan Kim
2011-12-22 12:20 ` Stefan Hajnoczi
2011-12-22 20:28 ` Christoph Hellwig
2011-12-21 1:00 ` [PATCH 5/6] virtio-blk: Support batch I/O for enhancing sequential IO Minchan Kim
2011-12-21 1:00 ` [PATCH 6/6] virtio-blk: Emulate Flush/FUA Minchan Kim
2011-12-21 5:08 ` [PATCH 0/6][RFC] virtio-blk: Change I/O path from request to BIO Rusty Russell
2011-12-21 5:56 ` Minchan Kim
2011-12-21 8:28 ` Sasha Levin
2011-12-21 8:17 ` Minchan Kim
2011-12-21 19:11 ` Vivek Goyal
2011-12-22 1:05 ` Minchan Kim
2011-12-22 15:45 ` Vivek Goyal
2011-12-22 23:26 ` Minchan Kim
2011-12-22 12:57 ` Stefan Hajnoczi
2011-12-22 23:41 ` Minchan Kim
2012-01-01 16:45 ` Stefan Hajnoczi
2012-01-02 7:48 ` Dor Laor
2012-01-02 16:12 ` Paolo Bonzini
2012-01-02 16:15 ` Christoph Hellwig
2012-01-02 16:18 ` Paolo Bonzini
2012-01-02 16:23 ` Christoph Hellwig
2012-01-02 16:18 ` Christoph Hellwig [this message]
2012-01-02 16:21 ` Avi Kivity
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