Re: Extreme high load with 12/7 4-releng

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From
Matt Dillon <dillon@earth.backplane.com>
Date
12 Dec 2000 14:46:40
Subject
Re: Extreme high load with 12/7 4-releng
Message-ID
200012122246.eBCMkb953654@earth.backplane.com


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::Sorry to say, the system performance degraded with the high load. In
::telnet, it felt like a system with load of 40. With the 'working' FreeBSD,
::the servers would still performance better (load >10) with twice the
::connections. I still suspect that it was related to the server start to
::swap heavily even with 200+M of Inact memory? The strange part was the swap
::Used stayed relatively low (>20M), but, with top, the swap In and Out
::changed every refresh.
::
::Regards
::
::Best regards
:
: That is very odd. Very very odd. Do a 'systat -vm 1' and let it run
: a while... observe the pagein and pageout statis in the upper right
: for 'VN PAGER' and 'SWAP PAGER' and tell me what you see.
:
: -Matt

I think I have an idea as to what might be wrong. I'm going to
experiment a bit over the next few days to try to solve the problem.
I think my low-memory patch might have blown the pageout algorithm.

-Matt


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