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Re: [Qemu-devel] [RFC] Replace posix-aio with custom thread pool
From: |
Andrea Arcangeli |
Subject: |
Re: [Qemu-devel] [RFC] Replace posix-aio with custom thread pool |
Date: |
Fri, 12 Dec 2008 12:51:33 +0100 |
On Fri, Dec 12, 2008 at 09:23:10AM +0100, Jens Axboe wrote:
> aio is only async with O_DIRECT, with buffered IO it's sync.
That's very bad, because aio is as needed for O_DIRECT as for buffered
read seeking workloads that otherwise have zero chance to fill the
I/O pipe... (well unless one is threading in userland which is obviously
less efficient than what aio could achieve in kernel space, even
without taking cfq screwed bucketing into account).
- Re: [Qemu-devel] [RFC] Replace posix-aio with custom thread pool, (continued)
- Re: [Qemu-devel] [RFC] Replace posix-aio with custom thread pool, Andrea Arcangeli, 2008/12/11
- Re: [Qemu-devel] [RFC] Replace posix-aio with custom thread pool, Gerd Hoffmann, 2008/12/11
- Re: [Qemu-devel] [RFC] Replace posix-aio with custom thread pool, Andrea Arcangeli, 2008/12/11
- Re: [Qemu-devel] [RFC] Replace posix-aio with custom thread pool, Gerd Hoffmann, 2008/12/11
- Re: [Qemu-devel] [RFC] Replace posix-aio with custom thread pool, Andrea Arcangeli, 2008/12/11
- Re: [Qemu-devel] [RFC] Replace posix-aio with custom thread pool, Gerd Hoffmann, 2008/12/11
- Re: [Qemu-devel] [RFC] Replace posix-aio with custom thread pool, Andrea Arcangeli, 2008/12/11
- Re: [Qemu-devel] [RFC] Replace posix-aio with custom thread pool, Gerd Hoffmann, 2008/12/11
- Re: [Qemu-devel] [RFC] Replace posix-aio with custom thread pool, Anthony Liguori, 2008/12/11
- Re: [Qemu-devel] [RFC] Replace posix-aio with custom thread pool, Jens Axboe, 2008/12/12
- Re: [Qemu-devel] [RFC] Replace posix-aio with custom thread pool,
Andrea Arcangeli <=
- Re: [Qemu-devel] [RFC] Replace posix-aio with custom thread pool, Jens Axboe, 2008/12/12
- Re: [Qemu-devel] [RFC] Replace posix-aio with custom thread pool, Andrea Arcangeli, 2008/12/12
- Re: [Qemu-devel] [RFC] Replace posix-aio with custom thread pool, Anthony Liguori, 2008/12/12
- Re: [Qemu-devel] [RFC] Replace posix-aio with custom thread pool, Chris Wright, 2008/12/12
- Re: [Qemu-devel] [RFC] Replace posix-aio with custom thread pool, Anthony Liguori, 2008/12/12
- Re: [Qemu-devel] [RFC] Replace posix-aio with custom thread pool, Chris Wright, 2008/12/12
- Re: [Qemu-devel] [RFC] Replace posix-aio with custom thread pool, Christoph Hellwig, 2008/12/11
- Re: [Qemu-devel] [RFC] Replace posix-aio with custom thread pool, Andrea Arcangeli, 2008/12/11
- Re: [Qemu-devel] [RFC] Replace posix-aio with custom thread pool, Christoph Hellwig, 2008/12/11
- Re: [Qemu-devel] [RFC] Replace posix-aio with custom thread pool, Anthony Liguori, 2008/12/11