From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 60620] guest loses frequently (multiple times per day!)
connectivity to network device
Date: Tue, 12 Nov 2013 14:26:03 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=60620
--- Comment #19 from Jason Wang ---
(In reply to Folkert van Heusden from comment #18)
> (In reply to Jason Wang from comment #17)
> > Created attachment 114331 [details]
> > patch to limit the head length of skb allocated
> > Would you care to test this patch to see if it solves your problem?
>
> I'm not an expert in kernel programming but wouldn't an oversized skb only
> affect the current incoming packet and not the whole interface stability?
Yes, the patch was just to limit the head length of a packet received by
tun/tap. Without this patch, host may try to allocate 64K contiguous memory at
one time which has a high possibility of failure when memory is fragmented or
under heavy stress. So this patch make sure only one page were allocated at one
time.
> Because what I see is that indeed packets get dropped and then after a while
> communication totally stops and also does not recover anymore (unless I
> rmmod/modprobe virtio_net).
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