From: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
To: Anthony Liguori <aliguori-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
Cc: kvm-devel <kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
Subject: Re: virtio_net missing interrupts?
Date: Mon, 07 Jan 2008 21:29:07 +0200 [thread overview]
Message-ID: <47827D83.4040302@qumranet.com> (raw)
In-Reply-To: <478275F2.5030507-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
Anthony Liguori wrote:
> Avi noticed that when using the virtio_net driver, ping responses stop
> coming in after 12 packets. ping will then throw an "sendmsg: no
> buffer space available" error.
>
> This occurs on all kernel versions (even 2.6.24).
>
Latencies are high at around 4ms when the packets do arrive.
Further speculation yielded the following: a non hrtimer kernel will
delay all packets by one jiffie due to the tx timer. For an unknown
reason, an arp packet is lost, so further echo requests are queued up
until the buffer is exhausted.
--
error compiling committee.c: too many arguments to function
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prev parent reply other threads:[~2008-01-07 19:29 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-07 18:56 virtio_net missing interrupts? Anthony Liguori
[not found] ` <478275F2.5030507-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2008-01-07 19:29 ` Avi Kivity [this message]
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