From: Carsten Otte <cotte@de.ibm.com>
To: Avi Kivity <avi@qumranet.com>
Cc: kvm-devel@lists.sourceforge.net, Marcelo Tosatti <mtosatti@redhat.com>
Subject: Re: [patch 2/2] QEMU: decrease console "refresh rate" with -nographic
Date: Tue, 15 Apr 2008 07:43:46 +0200 [thread overview]
Message-ID: <48044092.2080507@de.ibm.com> (raw)
In-Reply-To: <48043F8E.1040406@qumranet.com>
Avi Kivity wrote:
> Anthony Liguori wrote:
>> BTW, when we set O_ASYNC on the tap fd, we're eliminating O_NONBLOCK.
>> This means that we have to poll loop select() when readv()'ing packets
>> instead of just reading until hitting AGAIN. This means at least an
>> extra syscall per packet.
>
> I didn't know that O_ASYNC and O_NONBLOCK were mutually exclusive. Can
> you point me at the relevant documentation?
They should'nt be mutual exclusive. If they are, the tap driver
requires fixing afaics. The relevant documentation is the man page
open(2), and it doesn't state they are exclusive.
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next prev parent reply other threads:[~2008-04-15 5:43 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-11 18:38 [patch 0/2] SIGIO handling changes Marcelo Tosatti
2008-04-11 18:38 ` [patch 1/2] QEMU: use SIGARLM for alarm timers, enable SIGIO on qemu_set_fd_handler2() Marcelo Tosatti
2008-04-11 18:59 ` Anthony Liguori
2008-04-11 19:44 ` Marcelo Tosatti
2008-04-13 15:05 ` Avi Kivity
2008-04-11 19:51 ` Marcelo Tosatti
2008-04-11 18:38 ` [patch 2/2] QEMU: decrease console "refresh rate" with -nographic Marcelo Tosatti
2008-04-13 16:30 ` Anders
2008-04-14 15:02 ` Marcelo Tosatti
2008-04-14 16:24 ` Avi Kivity
2008-04-14 17:24 ` Marcelo Tosatti
2008-04-14 18:31 ` Anthony Liguori
2008-04-15 5:39 ` Avi Kivity
2008-04-15 5:43 ` Carsten Otte [this message]
2008-04-15 13:40 ` Anthony Liguori
2008-04-15 13:47 ` Avi Kivity
2008-04-15 15:12 ` Marcelo Tosatti
2008-04-15 5:40 ` Avi Kivity
2008-04-15 7:26 ` Anders
2008-04-15 9:27 ` Avi Kivity
2008-04-15 14:20 ` Anthony Liguori
2008-04-15 14:45 ` Avi Kivity
2008-04-15 15:04 ` Marcelo Tosatti
2008-04-15 15:34 ` Anthony Liguori
2008-04-15 15:43 ` Avi Kivity
2008-04-15 18:14 ` Anthony Liguori
2008-04-16 8:37 ` Avi Kivity
2008-04-16 10:26 ` Anders
2008-04-16 11:23 ` Avi Kivity
2008-04-16 13:53 ` Anthony Liguori
2008-04-16 14:24 ` Carsten Otte
2008-04-17 12:53 ` Avi Kivity
2008-04-17 9:37 ` Avi Kivity
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