[lkml]   [2011]   [Dec]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 0/6][RFC] virtio-blk: Change I/O path from request to BIO
On Wed, Dec 21, 2011 at 1:00 AM, Minchan Kim <> wrote:
> This patch is follow-up of Christohp Hellwig's work
> [RFC: ->make_request support for virtio-blk].
> Quote from hch
> "This patchset allows the virtio-blk driver to support much higher IOP
> rates which can be driven out of modern PCI-e flash devices.  At this
> point it really is just a RFC due to various issues."

Basic question to make sure I understood this series: does this patch
bypass the guest I/O scheduler (but then you added custom batching
code into virtio_blk.c)?

If you're stumped by the performance perhaps compare blktraces of the
request approach vs the bio approach. We're probably performing I/O
more CPU-efficiently but the I/O pattern itself is worse.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2011-12-22 13:59    [W:0.128 / U:3.120 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site