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Re: [Qemu-devel] [patch] non-blocking disk IO
From: |
Troy Benjegerdes |
Subject: |
Re: [Qemu-devel] [patch] non-blocking disk IO |
Date: |
Mon, 3 Oct 2005 20:35:55 -0500 |
User-agent: |
Mutt/1.5.9i |
On Mon, Oct 03, 2005 at 03:58:40PM +0200, Jens Axboe wrote:
> 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.
Why is there a posix async IO 'standard', but a different linux AIO standard?
Having something that wraps both Linux-native AIO and posix async I/O
might make supporting it a little easier to swallow on cross-platform
applications.
- Re: [Qemu-devel] [patch] non-blocking disk IO, (continued)
- 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, 2005/10/03
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
Re: [Qemu-devel] [patch] non-blocking disk IO, John Coiner, 2005/10/03