From: Anthony Liguori <aliguori@us.ibm.com>
To: "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
kvm-devel <kvm@vger.kernel.org>
Subject: Live migration broken when under heavy IO
Date: Mon, 15 Jun 2009 15:33:41 -0500 [thread overview]
Message-ID: <4A36B025.2080602@us.ibm.com> (raw)
The basic issue is that:
migrate_fd_put_ready(): bdrv_flush_all();
Does:
block.c:
foreach block driver:
drv->flush(bs);
Which in the case of raw, is just fsync(s->fd).
Any submitted request is not queued or flushed which will lead to the
request being dropped after the live migration.
Is anyone working on fixing this? Does anyone have a clever idea how to
fix this without just waiting for all IO requests to complete?
---
Regards,
Anthony Liguori
WARNING: multiple messages have this Message-ID (diff)
From: Anthony Liguori <aliguori@us.ibm.com>
To: "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
kvm-devel <kvm@vger.kernel.org>
Subject: [Qemu-devel] Live migration broken when under heavy IO
Date: Mon, 15 Jun 2009 15:33:41 -0500 [thread overview]
Message-ID: <4A36B025.2080602@us.ibm.com> (raw)
The basic issue is that:
migrate_fd_put_ready(): bdrv_flush_all();
Does:
block.c:
foreach block driver:
drv->flush(bs);
Which in the case of raw, is just fsync(s->fd).
Any submitted request is not queued or flushed which will lead to the
request being dropped after the live migration.
Is anyone working on fixing this? Does anyone have a clever idea how to
fix this without just waiting for all IO requests to complete?
---
Regards,
Anthony Liguori
next reply other threads:[~2009-06-15 20:33 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-15 20:33 Anthony Liguori [this message]
2009-06-15 20:33 ` [Qemu-devel] Live migration broken when under heavy IO Anthony Liguori
2009-06-15 20:48 ` Glauber Costa
2009-06-16 9:10 ` Avi Kivity
2009-06-16 9:10 ` [Qemu-devel] " Avi Kivity
2009-06-16 9:13 ` Avi Kivity
2009-06-16 9:13 ` [Qemu-devel] " Avi Kivity
2009-06-16 12:50 ` Anthony Liguori
2009-06-16 12:50 ` [Qemu-devel] " Anthony Liguori
2009-06-16 12:54 ` Avi Kivity
2009-06-16 12:54 ` [Qemu-devel] " Avi Kivity
2009-06-16 12:57 ` Anthony Liguori
2009-06-16 12:57 ` [Qemu-devel] " Anthony Liguori
2009-06-16 13:12 ` Avi Kivity
2009-06-16 13:12 ` [Qemu-devel] " Avi Kivity
2009-06-16 18:19 ` Charles Duffy
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