Bug#746453: linux-image-3.14-1-amd64: TUN device performance regression
Package: src:linux
Version: 3.14.2-1
Severity: important
Dear Maintainer,
Since 3.14-rc8, an upstream bug has caused a serious regression in tun performance, affecting for example users op OpenVPN.
The bug causes extremely slow transfer speeds/session freezes for traffic usinG tun devices.
The bug was fixed in 3.15-rc, however not in 3.14 (yet).
To reproduce:
- Configure a client/server VPN using OpenVPN (use 'dev tun')
- Start the VPN connection
- Start a SSH session over the VPN tunnel
- Type some commands causing a fair amount of output (like 'dmesg' a couple of times)
- Watch the output slow down or even stall
Upstream bug reports:
https://bugzilla.kernel.org/show_bug.cgi?id=73891
https://bugzilla.kernel.org/show_bug.cgi?id=74051
Patch:
http://www.spinics.net/lists/netdev/msg279297.html
https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=1e785f48d29a09b6cf96db7b49b6320dada332e1
Please consider including this patch.
Thanks,
Robbert
-- Package-specific info:
** Version:
Linux version 3.14-1-amd64 (debian-kernel@lists.debian.org) (gcc version 4.8.2 (Debian 4.8.2-21) ) #1 SMP Debian 3.14.2-1 (2014-04-28)
-- System Information:
Debian Release: jessie/sid
APT prefers testing-updates
APT policy: (500, 'testing-updates'), (500, 'testing')
Architecture: amd64 (x86_64)
Kernel: Linux 3.14-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Shell: /bin/sh linked to /bin/dash
Versions of packages linux-image-3.14-1-amd64 depends on:
ii debconf [debconf-2.0] 1.5.52
ii initramfs-tools [linux-initramfs-tool] 0.115
ii kmod 16-2
ii linux-base 3.5
ii module-init-tools 16-2
Versions of packages linux-image-3.14-1-amd64 recommends:
ii firmware-linux-free 3.3
Versions of packages linux-image-3.14-1-amd64 suggests:
pn debian-kernel-handbook <none>
pn grub-pc | extlinux | lilo <none>
pn linux-doc-3.14 <none>
Versions of packages linux-image-3.14-1-amd64 is related to:
pn firmware-atheros <none>
pn firmware-bnx2 <none>
pn firmware-bnx2x <none>
pn firmware-brcm80211 <none>
pn firmware-intelwimax <none>
pn firmware-ipw2x00 <none>
pn firmware-ivtv <none>
pn firmware-iwlwifi <none>
pn firmware-libertas <none>
pn firmware-linux <none>
pn firmware-linux-nonfree <none>
pn firmware-myricom <none>
pn firmware-netxen <none>
pn firmware-qlogic <none>
pn firmware-ralink <none>
pn firmware-realtek <none>
pn xen-hypervisor <none>
-- debconf information:
linux-image-3.14-1-amd64/postinst/depmod-error-initrd-3.14-1-amd64: false
linux-image-3.14-1-amd64/prerm/removing-running-kernel-3.14-1-amd64: true
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