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caker
Joined: 15 Apr 2003
Posts: 2404
Location: Galloway, NJ
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| Posted: Wed Jan 05, 2005 9:42 pm Post subject: host38 Kernel Upgrade |
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| Host38 is being upgraded and rebooted. More details in a few... |
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caker
Joined: 15 Apr 2003
Posts: 2404
Location: Galloway, NJ
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| Posted: Wed Jan 05, 2005 10:05 pm Post subject: |
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Ok. Host38's kernel has been upgraded and Linodes are restarting now.
There's a nasty bug in 2.6.9 which causes UML processes to not release their memory. So, each Linode reboot potentially did not release the memory it was using. This caused the host to kick in the OOM killer, which is why you guys were experiencing problems.
The new host kernel includes the cfq-time-sliced disk sched, so you should see a decent disk performance increase.
Sorry for the trouble.
-Chris |
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jp
Joined: 07 Jan 2004
Posts: 70
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| Posted: Thu Jan 06, 2005 6:49 am Post subject: |
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Quote: There's a nasty bug in 2.6.9 which causes UML processes to not release their memory.
Will this affect other hosts too? Should we expect a reboot?
-- jp |
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bji
Joined: 27 Aug 2003
Posts: 182
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| Posted: Thu Jan 06, 2005 10:34 am Post subject: |
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caker wrote:
The new host kernel includes the cfq-time-sliced disk sched, so you should see a decent disk performance increase.
Sorry for the trouble.
-Chris
Can we get a report from the Linode users on host38 about how significant an impact this cfq-time-sliced disk sched change has on performance? I'd love to hear that it mitigated the load spike problem, which still occurrs sometimes for me (although I'm not on host28, but if that kernel helps host28, then I'm all for upgrading host31 too). |
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CSpurrier
Joined: 23 Feb 2004
Posts: 22
Location: Aiken,SC USA
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| Posted: Thu Jan 06, 2005 11:35 am Post subject: |
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| It was very slow last night right after he fixed it, now it feels much faster then it used to be. |
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caker
Joined: 15 Apr 2003
Posts: 2404
Location: Galloway, NJ
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| Posted: Thu Jan 06, 2005 11:52 am Post subject: |
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jp wrote: Will this affect other hosts too? Should we expect a reboot?
There are no other hosts running 2.6.9, or any of the 2.6.10-rc based patches that were also affected. However, they'll still be a round of host kernel upgrades coming. Announcements and details are forthcoming.
-Chris |
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walter
Joined: 13 Dec 2004
Posts: 8
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| Posted: Fri Jan 07, 2005 1:18 pm Post subject: |
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bji wrote:
Can we get a report from the Linode users on host38 about how significant an impact this cfq-time-sliced disk sched change has on performance?
Performance seems to have increased a lot, but I have upgraded the ram of the system from 64 to 128, so i don't know how the the two things participated to the overall improvement.
bye |
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