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[...Please CC me on any replies, as I'm not on the list(s)...]
Folks:
I was experiencing problems with 2.2.16 where the box would go out
to lunch for a few seconds flushing buffer or paging at inopportune
times (is there ever an opportune time for the box to become non-
reponsive for 5 seconds? 8-).
2.2.19pre3 makes the behaviour much better, but I still see ~ 2sec
pauses at times. I'm sending this to the MM list as well, since I
believe the poor behaviour in 2.2.16 was an MM issue... I don't
know where the slowdowns are happening this time around.
The box in question is running the linux-ha.org heartbeat package,
which is a RT-scheduled, mlock()'ed process, and as such should
get as good service as the box is able to mange. Often, under
high disk (and/or MM) loads, the box becomes unreponsive for a
period of time from ~ 1 sec to a high of ~ 2.8sec.
The test is simply running a 'dd if=/dev/zero of=/u1/big-empty-file
bs=1k count=512000 && date'. Generally, the box will sieze up around
the same time as the the 'dd' finishes (maybe trying to exec date?).
I'd appreciate any hints at how to reduce the non-reponsiveness
window down as much as possible. I haven't yet looked to see if
there is a version of the low-latency patches for 2.2.18 or 19pre,
but I'd appreciate other ideas on tracking this down as well.
Thanks!
- --rafal
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Rafal Boni [EMAIL PROTECTED]
PGP key C7D3024C, print EA49 160D F5E4 C46A 9E91 524E 11E0 7133 C7D3 024C
Need to get a hold of me? http:[EMAIL PROTECTED]
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