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Re: [Qemu-devel] [PATCH] block: add the support to drain throttled reque
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] [PATCH] block: add the support to drain throttled requests |
Date: |
Fri, 23 Mar 2012 10:38:14 +0000 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Thu, Mar 22, 2012 at 07:07:52PM +0000, Chris Webb wrote:
> Stefan Hajnoczi <address@hidden> writes:
>
> > Yesterday I only posted an analysis of the bug but here are some
> > thoughts on how to move forward. Throttling itself is not the problem.
> > We've known that synchronous operations in the vcpu thread are a problem
> > long before throttling. This is just another reason to convert device
> > emulation to use asynchronous interfaces.
> >
> > Here is the list of device models that perform synchronous block I/O:
> > hw/fdc.c
> > hw/ide/atapi.c
> > hw/ide/core.c
> > hw/nand.c
> > hw/onenand.c
> > hw/pflash_cfi01.c
> > hw/pflash_cfi02.c
> > hw/sd.c
> >
> > Zhi Hui Li is working on hw/fdc.c and recently sent a patch.
> >
> > I think it's too close to QEMU 1.1 to convert all the remaining devices
> > and test them properly before the soft-freeze. But it's probably
> > possible to convert IDE before the soft-freeze.
>
> IDE is the only of these that would affect us as a typical user of
> throttling. The others aren't really the kind of devices which you'd be
> using in a hosting setting in any case.
Can you check whether your Windows guest has DMA or PIO mode enabled?
http://msdn.microsoft.com/en-us/windows/hardware/gg463526
Stefan
- [Qemu-devel] [PATCH] block: add the support to drain throttled requests, zwu . kernel, 2012/03/12
- Re: [Qemu-devel] [PATCH] block: add the support to drain throttled requests, Zhi Yong Wu, 2012/03/20
- Re: [Qemu-devel] [PATCH] block: add the support to drain throttled requests, Paolo Bonzini, 2012/03/20
- Re: [Qemu-devel] [PATCH] block: add the support to drain throttled requests, Kevin Wolf, 2012/03/20
- Re: [Qemu-devel] [PATCH] block: add the support to drain throttled requests, Stefan Hajnoczi, 2012/03/20
- Re: [Qemu-devel] [PATCH] block: add the support to drain throttled requests, Chris Webb, 2012/03/22
- Re: [Qemu-devel] [PATCH] block: add the support to drain throttled requests,
Stefan Hajnoczi <=
- Re: [Qemu-devel] [PATCH] block: add the support to drain throttled requests, Chris Webb, 2012/03/23
- Re: [Qemu-devel] [PATCH] block: add the support to drain throttled requests, Stefan Hajnoczi, 2012/03/23
- Re: [Qemu-devel] [PATCH] block: add the support to drain throttled requests, Richard Davies, 2012/03/23
- Re: [Qemu-devel] [PATCH] block: add the support to drain throttled requests, Stefan Hajnoczi, 2012/03/23
- Re: [Qemu-devel] [PATCH] block: add the support to drain throttled requests, Stefan Hajnoczi, 2012/03/23
- Re: [Qemu-devel] [PATCH] block: add the support to drain throttled requests, Stefan Hajnoczi, 2012/03/26
- Re: [Qemu-devel] [PATCH] block: add the support to drain throttled requests, Kevin Wolf, 2012/03/26
- Re: [Qemu-devel] [PATCH] block: add the support to drain throttled requests, Zhi Yong Wu, 2012/03/27
- Re: [Qemu-devel] [PATCH] block: add the support to drain throttled requests, Stefan Hajnoczi, 2012/03/27
Re: [Qemu-devel] [PATCH] block: add the support to drain throttled requests, Kevin Wolf, 2012/03/20