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Re: [Qemu-devel] [PATCH v4 00/10] main-loop: switch to g_poll(3) on POSI
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] [PATCH v4 00/10] main-loop: switch to g_poll(3) on POSIX hosts |
Date: |
Thu, 21 Feb 2013 16:33:52 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Thu, Feb 21, 2013 at 02:17:14PM +0100, Christian Borntraeger wrote:
> On 20/02/13 11:28, Stefan Hajnoczi wrote:
> > Amos Kong <address@hidden> reported that file descriptors numbered higher
> > than 1024 could crash QEMU. This is due to the fixed size of the fd_set
> > type
> > used for select(2) event polling.
> >
>
> Good to see somebody working on that.
> We have just faced this problem on s390 after we have experimentally enabled
> ioeventfd
> for virtio-ccw. We have several scenarios were we want > 600 devices for the
> guest
> and the select loops then fails horribly because we exceed the 1024 fd
> barrier.
>
> So this looks like it could become a bugfix for that problem.
>
> In terms of scalability it is probably better to have multiple threads that
> poll on their
> fds, instead of having one i/o thread.
I think we'll get there, I'm currently working on adding multiple event
loop support to QEMU.
Stefan
- [Qemu-devel] [PATCH v4 05/10] slirp: switch to GPollFD, (continued)
- [Qemu-devel] [PATCH v4 05/10] slirp: switch to GPollFD, Stefan Hajnoczi, 2013/02/20
- [Qemu-devel] [PATCH v4 06/10] iohandler: switch to GPollFD, Stefan Hajnoczi, 2013/02/20
- [Qemu-devel] [PATCH v4 09/10] aio: convert aio_poll() to g_poll(3), Stefan Hajnoczi, 2013/02/20
- [Qemu-devel] [PATCH v4 10/10] aio: support G_IO_HUP and G_IO_ERR, Stefan Hajnoczi, 2013/02/20
- [Qemu-devel] [PATCH v4 07/10] main-loop: drop rfds/wfds/xfds for good, Stefan Hajnoczi, 2013/02/20
- Re: [Qemu-devel] [PATCH v4 00/10] main-loop: switch to g_poll(3) on POSIX hosts, Laszlo Ersek, 2013/02/20
- Re: [Qemu-devel] [PATCH v4 00/10] main-loop: switch to g_poll(3) on POSIX hosts, Michael S. Tsirkin, 2013/02/20
- Re: [Qemu-devel] [PATCH v4 00/10] main-loop: switch to g_poll(3) on POSIX hosts, Christian Borntraeger, 2013/02/21
- Re: [Qemu-devel] [PATCH v4 00/10] main-loop: switch to g_poll(3) on POSIX hosts,
Stefan Hajnoczi <=
- Re: [Qemu-devel] [PATCH v4 00/10] main-loop: switch to g_poll(3) on POSIX hosts, Jan Kiszka, 2013/02/21
- Re: [Qemu-devel] [PATCH v4 00/10] main-loop: switch to g_poll(3) on POSIX hosts, Paolo Bonzini, 2013/02/21
- Re: [Qemu-devel] [PATCH v4 00/10] main-loop: switch to g_poll(3) on POSIX hosts, Anthony Liguori, 2013/02/21
- Re: [Qemu-devel] [PATCH v4 00/10] main-loop: switch to g_poll(3) on POSIX hosts, Paolo Bonzini, 2013/02/21
- Re: [Qemu-devel] [PATCH v4 00/10] main-loop: switch to g_poll(3) on POSIX hosts, Anthony Liguori, 2013/02/21
- Re: [Qemu-devel] [PATCH v4 00/10] main-loop: switch to g_poll(3) on POSIX hosts, Jan Kiszka, 2013/02/21
- Re: [Qemu-devel] [PATCH v4 00/10] main-loop: switch to g_poll(3) on POSIX hosts, Stefan Hajnoczi, 2013/02/22
- Re: [Qemu-devel] [PATCH v4 00/10] main-loop: switch to g_poll(3) on POSIX hosts, Jan Kiszka, 2013/02/22
Re: [Qemu-devel] [PATCH v4 00/10] main-loop: switch to g_poll(3) on POSIX hosts, Laszlo Ersek, 2013/02/21