From: Avi Kivity <avi@redhat.com>
To: Matthew Tippett <tippettm@gmail.com>
Cc: kvm@vger.kernel.org
Subject: Re: sync guest calls made async on host - SQLite performance
Date: Thu, 24 Sep 2009 16:03:03 +0300 [thread overview]
Message-ID: <4ABB6E07.60909@redhat.com> (raw)
In-Reply-To: <f28b49ce0909240531i131f543gab7ccd1b1bcb25b5@mail.gmail.com>
On 09/24/2009 03:31 PM, Matthew Tippett wrote:
> Thanks Avi,
>
> I am still trying to reconcile the your statement with the potential
> data risks and the numbers observed.
>
> My read of your response is that the guest sees a consistent view -
> the data is commited to the virtual disk device. Does a synchronous
> write within the guest trigger a synchronous write of the virtual
> device within the host?
>
Yes.
> I don't think offering SQLite users a 10 fold increase in performance
> with no data integrity risks just by using KVM is a sane proposition.
>
It isn't, my guess is that the test setup is broken somehow.
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
next prev parent reply other threads:[~2009-09-24 13:03 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-23 15:58 sync guest calls made async on host - SQLite performance Matthew Tippett
2009-09-24 11:44 ` Avi Kivity
2009-09-24 12:31 ` Matthew Tippett
2009-09-24 13:03 ` Avi Kivity [this message]
2009-09-24 19:49 ` Matthew Tippett
2009-09-25 7:22 ` Avi Kivity
2009-09-25 11:33 ` Matthew Tippett
2009-09-25 15:04 ` Avi Kivity
2009-09-29 18:58 ` Anthony Liguori
2009-09-29 18:57 ` Anthony Liguori
2009-09-29 18:54 ` Anthony Liguori
-- strict thread matches above, loose matches on Subject: below --
2009-09-25 2:11 Ian Woodstock
2009-09-25 3:13 ` Matthew Tippett
2009-09-25 7:00 RW
2009-09-27 11:37 ` Avi Kivity
2009-09-27 12:07 ` Matthew Tippett
2009-09-29 19:02 ` Anthony Liguori
2009-09-29 19:32 ` Matthew Tippett
2009-09-29 20:46 ` Dustin Kirkland
2009-09-29 20:51 ` Anthony Liguori
2009-10-07 14:15 ` Matthew Tippett
2009-10-07 16:53 ` Matthew Tippett
2009-10-07 18:59 ` Dustin Kirkland
2009-10-07 19:31 ` Matthew Tippett
2009-10-07 20:12 ` Avi Kivity
2009-10-07 21:01 ` Matthew Tippett
2009-10-09 6:05 ` Dustin Kirkland
[not found] ` <4ACE0196.9010904@gmail.com>
[not found] ` <d9c105ea0910082312n7218e1abhc69a2be660838e89@mail.gmail.com>
[not found] ` <f28b49ce0910090425p385636c3he6dfb7595927d7e4@mail.gmail.com>
2009-10-09 15:18 ` Dustin Kirkland
2009-10-09 19:06 ` Matthew Tippett
2009-10-11 9:16 ` Avi Kivity
2009-10-13 22:37 ` Christoph Hellwig
2009-10-14 11:03 ` Avi Kivity
2009-10-14 13:41 ` Christoph Hellwig
2009-10-14 16:56 ` Avi Kivity
2009-10-14 17:02 ` Christoph Hellwig
2009-10-14 22:54 ` Anthony Liguori
2009-10-14 23:37 ` Avi Kivity
2009-10-15 12:17 ` Christoph Hellwig
2009-10-15 12:36 ` Christoph Hellwig
2009-10-19 5:56 ` Avi Kivity
2009-10-13 23:08 ` Anthony Liguori
2009-10-14 2:09 ` Matthew Tippett
2009-10-14 4:12 ` Dustin Kirkland
2009-10-14 11:32 ` Matthew Tippett
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