Re: [3.15-rc3] Bisected: xen-netback mangles packets between two guests on a bridge since merge of "TX grant mapping with SKBTX_DEV_ZEROCOPY instead of copy" series.
From: Sander Eikelenboom <hidden>
Date: 2014-05-06 17:37:23
Also in:
xen-devel
Tuesday, May 6, 2014, 7:13:44 PM, you wrote:
On 06/05/14 18:07, Steven Haigh wrote:quoted
On a related note, I'm seeing this on an Arch Linux DomU and kernel 3.14.2. Its running aria2c bit torrent client. The Dom0 is EL6 with Xen 4.2.4 / 3.14.2 kernel. I also lodged this on the Arch bug tracker: https://bugs.archlinux.org/task/40244 In a nutshell, I see: [ 7432.398096] xen_netfront: xennet: skb rides the rocket: 19 slots [ 7434.270870] xen_netfront: xennet: skb rides the rocket: 19 slots [ 7434.782199] xen_netfront: xennet: skb rides the rocket: 19 slots [ 7435.184794] xen_netfront: xennet: skb rides the rocket: 19 slots [ 7437.530677] xen_netfront: xennet: skb rides the rocket: 19 slots [ 7437.973905] xen_netfront: xennet: skb rides the rocket: 19 slots [ 7438.383947] xen_netfront: xennet: skb rides the rocket: 19 slots
Can you also see packet corruption? You can find a testfile generator in Sander's mail, downloading from an Apache server with wget seems to be OK.
The corruption shouldn't be there since he is running 3.14.2 which is fine. And note that the corruption with 3.15 only seems to occur in traffic between guests and not between dom0 and guest. The bit torrent traffic is probably inet <-> dom0 <-> guest, so shouldn't be affected, even with 3.15. -- Sander