From: Badari Pulavarty <pbadari@us.ibm.com>
To: Avi Kivity <avi@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>, kvm@vger.kernel.org
Subject: Re: [RFC] vhost-blk implementation
Date: Thu, 25 Mar 2010 07:36:45 -0700 [thread overview]
Message-ID: <4BAB74FD.2090009@us.ibm.com> (raw)
In-Reply-To: <4BAB1765.2070707@redhat.com>
Avi Kivity wrote:
> 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.
>
Sure. In my tests, I did O_DIRECT in the guest - so there is no
readahead in the guest.
Thanks,
Badari
next prev parent reply other threads:[~2010-03-25 14:36 UTC|newest]
Thread overview: 47+ 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
2010-04-07 0:36 ` 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
2010-03-25 14:36 ` Badari Pulavarty [this message]
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
-- strict thread matches above, loose matches on Subject: below --
2010-03-23 0:34 Badari Pulavarty
2010-03-23 12:39 ` Michael S. Tsirkin
2010-03-23 14:47 ` Badari Pulavarty
2010-03-23 17:57 ` Badari Pulavarty
2010-03-23 18:06 ` Michael S. Tsirkin
2010-03-23 19:55 ` Badari Pulavarty
2010-03-24 9:52 ` Michael S. Tsirkin
2010-03-24 11:23 ` Michael S. Tsirkin
2010-03-24 17:58 ` Badari Pulavarty
2010-03-24 18:28 ` Michael S. Tsirkin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4BAB74FD.2090009@us.ibm.com \
--to=pbadari@us.ibm.com \
--cc=avi@redhat.com \
--cc=hch@infradead.org \
--cc=kvm@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.