Since 8.04 is termed LTS and what a lot of people use for server OS, can
someone please backport this to Heron?
--
2.6.27 default TCP congestion control regression...
https://bugs.launchpad.net/bugs/278801
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I hate workarounds, but until this is changed (not my decision, but a
difficult/policy one), this is handy:
echo 'echo cubic /proc/sys/net/ipv4/tcp_congestion_control'
/etc/rc.local
--
2.6.27 default TCP congestion control regression...
https://bugs.launchpad.net/bugs/278801
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Actually, since the module is not loaded by default, I ended up putting
tcp_cubic in /etc/modules and adding an entry to /etc/sysctl.conf
Seems to work.
--
2.6.27 default TCP congestion control regression...
https://bugs.launchpad.net/bugs/278801
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** Changed in: ubuntu-ps3-port
Status: Triaged = Fix Released
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2.6.27 default TCP congestion control regression...
https://bugs.launchpad.net/bugs/278801
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This bug was fixed in the package linux-ports - 2.6.28-1.1
---
linux-ports (2.6.28-1.1) jaunty; urgency=low
[ Luke Yelavich ]
* SAUCE: Add rebase-ports and retag-ports scripts based on the scripts
used for the lpia kernel
* Remove build depends on gcc 4.1 for powerpc and
Is there any performance test that compares reno to cubic?
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2.6.27 default TCP congestion control regression...
https://bugs.launchpad.net/bugs/278801
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You can use iperf and many other related. It's a question of testing
high BDP and lossy, eg wireless networks, especially with multiple
flows. There probably are a lot of tests already out there.
--
2.6.27 default TCP congestion control regression...
https://bugs.launchpad.net/bugs/278801
You
The i386 and PowerPC Intrepid ports kernels also need to be updated to
use cubic:
$ git grep DEFAULT_TCP_CONG
config/hppa/config:CONFIG_DEFAULT_TCP_CONG=cubic
config/i386/config:CONFIG_DEFAULT_TCP_CONG=reno
config/ia64/config:CONFIG_DEFAULT_TCP_CONG=cubic
** Also affects: ubuntu-ps3-port
Importance: Undecided
Status: New
** Changed in: ubuntu-ps3-port
Importance: Undecided = Medium
Status: New = Triaged
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2.6.27 default TCP congestion control regression...
https://bugs.launchpad.net/bugs/278801
You received this bug
Fix committed to the ubuntu-ports-jaunty branch. We can SRU the ports
kernel for this as well.
** Changed in: linux-ports (Ubuntu)
Importance: Undecided = Medium
Assignee: (unassigned) = Michael Casadevall (sonicmctails)
Status: Confirmed = Fix Committed
Target: None =
** Also affects: linux-lpia (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux-lpia (Ubuntu)
Importance: Undecided = Medium
Assignee: (unassigned) = Amit Kucheria (amitk)
Status: New = Fix Committed
Target: None = ubuntu-8.10
--
2.6.27 default TCP
This bug was fixed in the package linux-lpia - 2.6.27-4.9
---
linux-lpia (2.6.27-4.9) intrepid; urgency=low
[ Amit Kucheria ]
* SAUCE: Start new release Ignore: yes
* SAUCE: Add LPIA keyword in front of all our tags
* SAUCE: Disable DYANMIC_FTRACE
- LP: #263555
*
This bug was fixed in the package linux - 2.6.27-7.11
---
linux (2.6.27-7.11) intrepid; urgency=low
[ Amit Kucheria ]
* STABLE queue: mac80211: fix two issues in debugfs
- LP: #275227
* SAUCE: Adds support for COMPAL JHL90 webcam
[ Ben Collins ]
* SAUCE: (no-up) x86:
Yes, it can easily changed at runtime, but this is not the usage bug we
have.
All the users of Ubuntu Intrepid will get penalised by the poor scaling
and unfairness of TCP Reno (using blind congestion control [1]), which
is why TCP cubic was introduced and became default in 2.6.19, some 2
years
While cubic may be the upstream default, its unlikely that it'll
change from reno this close to release. Instead, you can change it at
runtime, e.g.,
sudo su -
modprobe tcp_cubic
echo cubic /proc/sys/net/ipv4/tcp_congestion_control
exit
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2.6.27 default TCP congestion control regression...
Hi Daniel,
I can bring this to the attention of the Ubuntu kernel team. However,
with it being less than a week away from the Intrepid kernel freeze, I'm
uncertain of the likelyhood of this getting resolved prior to Intrepid
final and may have to wait for Jaunty.
** Changed in: linux (Ubuntu)
What can I do to expedite this change?
This is crucial particularly for high bandwidth links, which are have a
higher latency-bandwidth ratio (eg xDSL, 10gigE), and particularly
networks where some loss is expected (eg internet, wireless LAN).
--
2.6.27 default TCP congestion control
Confirmed that this is still the default in linux-
image-2.6.27-6-generic-2.6.27-6.9 and that the default config for the
upstream kernel is cubic.
** Tags added: bitesize
** Changed in: linux (Ubuntu)
Status: New = Confirmed
--
2.6.27 default TCP congestion control regression...
I do note that 2.6.24 in hardy/8.04 was still using reno by default,
so this wouldn't be a potential regression in Intrepid.
** Tags removed: regression-potential
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2.6.27 default TCP congestion control regression...
https://bugs.launchpad.net/bugs/278801
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** Tags added: regression-potential
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2.6.27 default TCP congestion control regression...
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