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Re: [Qemu-devel] [patch] non-blocking disk IO
From: |
Jens Axboe |
Subject: |
Re: [Qemu-devel] [patch] non-blocking disk IO |
Date: |
Mon, 3 Oct 2005 15:58:40 +0200 |
On Mon, Oct 03 2005, John Coiner wrote:
>
> Non-blocking disk IO now works for any type of disk image, not just
> "raw" format. There is no longer any format-specific code in the patch:
>
> http://people.brandeis.edu/~jcoiner/qemu_idedma/qemu_dma_patch.html
>
> You might want this patch if:
> * you run a multitasking guest OS,
> * you access a disk sometimes, and
> * you wouldn't mind if QEMU ran a little faster.
>
> Why I have not got feedback in droves I do not understand ;)
Why not use aio for this instead, seems like a better fit than spawning
a thread per block device? That would still require a thread for
handling completions, but you could easily just use a single completion
thread for all devices for this as it would not need to do any real
work.
--
Jens Axboe
- Re: [Qemu-devel] [patch] non-blocking disk IO, (continued)
- Re: [Qemu-devel] [patch] non-blocking disk IO, Elefterios Stamatogiannakis, 2005/10/03
- Re: [Qemu-devel] [patch] non-blocking disk IO, Christian MICHON, 2005/10/03
- Re: [Qemu-devel] [patch] non-blocking disk IO, John Coiner, 2005/10/04
- Re: [Qemu-devel] [patch] non-blocking disk IO, Christian MICHON, 2005/10/04
- Re: [Qemu-devel] [patch] non-blocking disk IO, Elefterios Stamatogiannakis, 2005/10/04
- Re: [Qemu-devel] [patch] non-blocking disk IO, Christian MICHON, 2005/10/04
- Re: [Qemu-devel] [patch] non-blocking disk IO, Christian MICHON, 2005/10/04
- Re: [Qemu-devel] [patch] non-blocking disk IO, Jens Axboe, 2005/10/04
- Re: [Qemu-devel] [patch] non-blocking disk IO, John Coiner, 2005/10/04
- Re: [Qemu-devel] [patch] non-blocking disk IO, Christian MICHON, 2005/10/04
Re: [Qemu-devel] [patch] non-blocking disk IO,
Jens Axboe <=
Re: [Qemu-devel] [patch] non-blocking disk IO, John Coiner, 2005/10/03
Re: [Qemu-devel] [patch] non-blocking disk IO, Fabrice Bellard, 2005/10/03
Re: [Qemu-devel] [patch] non-blocking disk IO, Brad Campbell, 2005/10/04