From: Alex Bligh <alex@alex.org.uk>
To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Alex Bligh <alex@alex.org.uk>,
Xen Devel <xen-devel@lists.xen.org>,
Ian Campbell <Ian.Campbell@citrix.com>,
Jan Beulich <JBeulich@suse.com>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Subject: Re: Fatal crash on xen4.2 HVM + qemu-xen dm + NFS
Date: Thu, 07 Mar 2013 08:16:27 +0000 [thread overview]
Message-ID: <B36DBA00F0BC1FA3E6F3FF32@nimrod.local> (raw)
In-Reply-To: <20130307010153.GC12421@phenom.dumpdata.com>
Konrad,
--On 6 March 2013 20:01:53 -0500 Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> wrote:
>> Results are positive.
>
> Great!
Does that mean some sort of switch to turn off O_DIRECT (or turning it off
by default) can go into qemu?
> Thought it is interesting that the application is doing write and sync
> (WS) for other blocks (like 2013633), which I thought would have
> been the case if the file was opened with O_SYNC. The sparsecopy
> code does not seem to do it?
On both host and guest every single write has 'S' set. You are correct that
sparsecopy doesn't open with O_SYNC. Perhaps it's the fact that it's the
fdatasync() which is causing the writes from the page cache (and that by
definition is blocking) which causes blktrace to see 'S' bits? I think it
was writing 4k blocks and syncing every 16k.
--
Alex Bligh
prev parent reply other threads:[~2013-03-07 8:16 UTC|newest]
Thread overview: 91+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-14 14:54 Fatal crash on xen4.2 HVM + qemu-xen dm + NFS Alex Bligh
2012-12-17 10:10 ` Jan Beulich
2012-12-17 17:09 ` Alex Bligh
2013-01-16 10:56 ` Alex Bligh
2013-01-16 14:34 ` Stefano Stabellini
2013-01-16 15:06 ` Alex Bligh
2013-01-16 16:00 ` Alex Bligh
2013-01-16 16:27 ` Stefano Stabellini
2013-01-16 17:13 ` Alex Bligh
2013-01-16 17:33 ` Stefano Stabellini
2013-01-16 17:39 ` Stefano Stabellini
2013-01-16 18:14 ` Alex Bligh
2013-01-16 18:49 ` Stefano Stabellini
2013-01-16 19:00 ` Stefano Stabellini
2013-01-17 7:58 ` Alex Bligh
2013-01-16 18:12 ` Alex Bligh
2013-01-21 15:15 ` Alex Bligh
2013-01-21 15:23 ` Ian Campbell
2013-01-21 15:35 ` Alex Bligh
2013-01-21 15:50 ` Ian Campbell
2013-01-21 16:33 ` Alex Bligh
2013-01-21 16:51 ` Ian Campbell
2013-01-21 17:06 ` Alex Bligh
2013-01-21 17:29 ` Ian Campbell
2013-01-21 17:31 ` Alex Bligh
2013-01-21 17:32 ` Ian Campbell
2013-01-21 18:14 ` Alex Bligh
2013-01-22 10:05 ` Ian Campbell
2013-01-22 13:02 ` Alex Bligh
2013-01-22 13:13 ` Ian Campbell
2013-01-21 20:37 ` Alex Bligh
2013-01-22 10:07 ` Ian Campbell
2013-01-22 13:01 ` Alex Bligh
2013-01-22 13:14 ` Ian Campbell
2013-01-22 13:18 ` Alex Bligh
2013-01-22 10:13 ` Ian Campbell
2013-01-22 12:59 ` Alex Bligh
2013-01-22 15:46 ` Stefano Stabellini
2013-01-22 15:42 ` Stefano Stabellini
2013-01-22 16:09 ` Stefano Stabellini
2013-01-22 20:31 ` Alex Bligh
2013-01-23 11:52 ` Stefano Stabellini
2013-01-23 15:19 ` Alex Bligh
2013-01-23 16:29 ` Stefano Stabellini
2013-01-25 11:28 ` Alex Bligh
2013-02-05 15:40 ` Alex Bligh
2013-02-22 17:28 ` Alex Bligh
2013-02-22 17:41 ` Konrad Rzeszutek Wilk
2013-02-22 18:00 ` Stefano Stabellini
2013-02-22 19:53 ` Alex Bligh
2013-03-06 11:50 ` Alex Bligh
2013-03-07 1:01 ` Konrad Rzeszutek Wilk
2013-03-07 4:15 ` Stefano Stabellini
2013-03-07 10:47 ` [PATCH] QEMU(upstream): Disable xen's use of O_DIRECT by default as it results in crashes Alex Bligh
2013-03-08 3:18 ` Stefano Stabellini
2013-03-08 9:25 ` [PATCHv2] " Alex Bligh
2013-03-08 9:26 ` [PATCH] " Alex Bligh
2013-03-08 10:17 ` George Dunlap
2013-03-08 10:27 ` Alex Bligh
2013-03-08 10:35 ` George Dunlap
2013-03-08 10:50 ` Alex Bligh
2013-03-08 11:18 ` George Dunlap
2013-03-08 11:40 ` [PATCHv3] " Alex Bligh
2013-03-08 12:54 ` George Dunlap
2013-03-11 14:02 ` Alex Bligh
2013-03-11 14:42 ` George Dunlap
2013-03-11 17:48 ` Konrad Rzeszutek Wilk
2013-03-11 17:55 ` Ian Jackson
2013-03-14 17:06 ` Alex Bligh
2013-03-14 18:26 ` Ian Jackson
2013-03-12 12:08 ` Ian Campbell
2013-03-14 18:37 ` Stefano Stabellini
2013-03-14 19:30 ` Ian Jackson
2013-03-14 19:56 ` Alex Bligh
2013-03-15 9:28 ` Ian Campbell
2013-03-15 10:43 ` Stefano Stabellini
2013-03-15 11:21 ` Ian Jackson
2013-03-15 11:28 ` Stefano Stabellini
2013-03-15 11:37 ` Ian Jackson
2013-03-15 11:43 ` Stefano Stabellini
2013-03-15 12:43 ` Alex Bligh
2013-03-15 12:50 ` Ian Campbell
2013-03-15 18:31 ` Ian Jackson
2013-03-18 10:29 ` Alex Bligh
2013-03-18 11:47 ` Stefano Stabellini
2013-03-18 12:21 ` Alex Bligh
2013-03-08 11:41 ` [PATCH] " Alex Bligh
2013-03-08 10:28 ` George Dunlap
2013-03-08 10:45 ` Alex Bligh
2013-03-07 10:51 ` Fatal crash on xen4.2 HVM + qemu-xen dm + NFS Alex Bligh
2013-03-07 8:16 ` Alex Bligh [this message]
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