From: Avi Kivity <avi@redhat.com>
To: Badari Pulavarty <pbadari@us.ibm.com>
Cc: Christoph Hellwig <hch@infradead.org>, kvm@vger.kernel.org
Subject: Re: [RFC] vhost-blk implementation
Date: Thu, 25 Mar 2010 09:57:25 +0200 [thread overview]
Message-ID: <4BAB1765.2070707@redhat.com> (raw)
In-Reply-To: <4BAA748D.40509@us.ibm.com>
On 03/24/2010 10:22 PM, Badari Pulavarty wrote:
>> Which caching mode is this? I assume data=writeback, because otherwise
>> you'd be doing synchronous I/O directly from the handler.
>
>
> Yes. This is with default (writeback) cache model. As mentioned
> earlier, readhead is helping here
> and most cases, data would be ready in the pagecache.
btw, relying on readahead is problematic. The guest already issues
readahead requests, and the host will issue readahead based on that
readahead, reading far into the future.
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
next prev parent reply other threads:[~2010-03-25 7:57 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-23 1:00 [RFC] vhost-blk implementation Badari Pulavarty
2010-03-23 1:16 ` Anthony Liguori
2010-03-23 1:45 ` Badari Pulavarty
2010-03-23 2:00 ` Anthony Liguori
2010-03-23 2:50 ` Badari Pulavarty
2010-03-23 10:05 ` Avi Kivity
2010-03-23 14:48 ` Badari Pulavarty
2010-03-23 10:03 ` Avi Kivity
2010-03-23 14:55 ` Badari Pulavarty
2010-03-23 16:53 ` Avi Kivity
2010-03-24 20:05 ` Christoph Hellwig
2010-03-25 6:29 ` Avi Kivity
2010-03-25 15:48 ` Christoph Hellwig
2010-03-25 15:51 ` Avi Kivity
2010-03-25 15:00 ` Asdo
2010-04-05 19:59 ` Christoph Hellwig
2010-04-07 0:36 ` [RFC] vhost-blk implementation (v2) Badari Pulavarty
2010-03-23 10:09 ` [RFC] vhost-blk implementation Eran Rom
2010-03-24 20:04 ` Christoph Hellwig
2010-03-24 20:22 ` Badari Pulavarty
2010-03-25 7:57 ` Avi Kivity [this message]
2010-03-25 14:36 ` Badari Pulavarty
2010-03-25 15:57 ` Christoph Hellwig
2010-03-26 18:53 ` Eran Rom
2010-04-08 16:17 ` Stefan Hajnoczi
2010-04-05 19:23 ` Christoph Hellwig
2010-04-05 23:17 ` Badari Pulavarty
2010-03-24 20:27 ` Badari Pulavarty
2010-03-29 15:41 ` Badari Pulavarty
2010-03-29 18:20 ` Chris Wright
2010-03-29 20:37 ` Avi Kivity
2010-03-29 22:51 ` Badari Pulavarty
2010-03-29 23:56 ` Chris Wright
2010-03-30 12:43 ` Avi Kivity
2010-04-05 14:22 ` Stefan Hajnoczi
2010-04-06 2:27 ` Badari Pulavarty
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