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Re: [Qemu-devel] [PATCH] block: add the support to drain throttled reque
From: |
Chris Webb |
Subject: |
Re: [Qemu-devel] [PATCH] block: add the support to drain throttled requests |
Date: |
Fri, 23 Mar 2012 10:43:28 +0000 |
User-agent: |
Mutt/1.5.20 (2009-06-14) |
Stefan Hajnoczi <address@hidden> writes:
> 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
Hi. We were producing the IDE assert()s and deadlocks with linux kernels.
Although I believe the same symptoms exist on windows, I haven't actually
tested it myself. Typically they would show up in the 16-bit bootloader
code, even before the 32-bit OS has started.
Cheers,
Chris.
- [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, 2012/03/23
- Re: [Qemu-devel] [PATCH] block: add the support to drain throttled requests,
Chris Webb <=
- 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