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Re: [Qemu-devel] [PATCH] block: add the support to drain throttled reque
From: |
Kevin Wolf |
Subject: |
Re: [Qemu-devel] [PATCH] block: add the support to drain throttled requests |
Date: |
Tue, 20 Mar 2012 10:58:10 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:10.0.1) Gecko/20120209 Thunderbird/10.0.1 |
Am 20.03.2012 10:47, schrieb Paolo Bonzini:
> Il 20/03/2012 10:40, Zhi Yong Wu ha scritto:
>> HI, Kevin,
>>
>> We hope that I/O throttling can be shipped without known issue in QEMU
>> 1.1, so if you are available, can you give this patch some love?
>
> I'm sorry to say this, but I think I/O throttling is impossible to save.
> As it is implemented now, it just cannot work in the presence of
> synchronous I/O, except at the cost of busy waiting with the global
> mutex taken. See the message from Stefan yesterday.
qemu_aio_flush() is busy waiting with the global mutex taken anyway, so
it doesn't change that much.
Kevin
- [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 <=
- 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, 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