From: Ian Campbell <Ian.Campbell@citrix.com>
To: ANNIE LI <annie.li@oracle.com>
Cc: Sander Eikelenboom <linux@eikelenboom.it>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
xen-devel <xen-devel@lists.xen.org>
Subject: Re: xennet: skb rides the rocket: 20 slots
Date: Tue, 8 Jan 2013 10:05:49 +0000 [thread overview]
Message-ID: <1357639549.7989.147.camel@zakaz.uk.xensource.com> (raw)
In-Reply-To: <50EB8091.90705@oracle.com>
On Tue, 2013-01-08 at 02:12 +0000, ANNIE LI wrote:
> >>
> >> I have added some extra info, but i don't have enough knowledge if
> >> this could/should be prevented from happening ?
> > MAX_SKB_FRAGS has never, AFAIK, been as big as 19 or 20 so I'm not sure
> > this can have ever worked.
> >
> > These SKBs seem to be pretty big (not quite 64KB), seemingly most of the
> > data is contained in a smallish number of frags, which suggests compound
> > pages and therefore a reasonably modern kernel?
> >
> > This probably relates somewhat to the issues described in the
> > "netchannel vs MAX_SKB_FRAGS" thread last year, or at least the solution
> > to that would necessarily involve fixing this issue.
>
> If netback complains about "Too many frags", then it should be
> MAX_SKB_FRAGS limitation in netback results in dropping packets in
> netfront. It is possible that other netfronts(windows?) also hit this.
It's very possible. I rather suspect that non-Linux frontends have
workarounds (e.g. manual resegmenting etc) for this case.
Ian.
next prev parent reply other threads:[~2013-01-08 10:05 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-04 16:28 xennet: skb rides the rocket: 20 slots Sander Eikelenboom
2013-01-07 10:55 ` Ian Campbell
2013-01-07 12:30 ` Sander Eikelenboom
2013-01-07 13:27 ` Ian Campbell
2013-01-07 14:05 ` Sander Eikelenboom
2013-01-07 14:12 ` Ian Campbell
2013-01-08 2:12 ` ANNIE LI
2013-01-08 10:05 ` Ian Campbell [this message]
2013-01-08 10:16 ` Paul Durrant
2013-01-08 20:57 ` James Harper
2013-01-08 22:04 ` Konrad Rzeszutek Wilk
2013-01-08 20:55 ` Sander Eikelenboom
2013-01-09 7:10 ` ANNIE LI
2013-01-09 15:08 ` Konrad Rzeszutek Wilk
2013-01-09 16:34 ` Ian Campbell
2013-01-09 17:05 ` Konrad Rzeszutek Wilk
2013-01-09 18:02 ` Ian Campbell
2013-01-10 11:22 ` ANNIE LI
2013-01-10 12:24 ` Sander Eikelenboom
2013-01-10 12:26 ` Ian Campbell
2013-01-10 15:39 ` Konrad Rzeszutek Wilk
2013-01-10 16:25 ` Ian Campbell
2013-01-11 7:34 ` ANNIE LI
2013-01-11 9:56 ` Ian Campbell
2013-01-11 10:09 ` Paul Durrant
2013-01-11 10:16 ` Ian Campbell
[not found] ` <50F3D269.6030601@oracle.com>
2013-03-09 12:56 ` Fwd: " Sander Eikelenboom
[not found] ` <19010312768.20130124094542@eikelenboom.it>
2013-03-09 12:57 ` Sander Eikelenboom
2013-03-10 5:22 ` ANNIE LI
2013-03-12 11:37 ` Ian Campbell
2013-03-15 5:14 ` annie li
2013-03-15 21:29 ` Sander Eikelenboom
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