Yes i know this.
But my problem is : just by upgrading kernel, the memory usage and the load average explode.
With 2.4.18-10, i'm using 700Mo of memory, and load is 1.
With 2.5.18-19, i'm using 2 Go of memory and load is 3-4.
With the same software and the same number of process !
And i don't know why.
Yoink! wrote:
On Thu, 9 Jan 2003, [ISO-8859-1] J?r?me Bolliet wrote:We are using redhat 7.3 on Compaq DL360 2 processors with kernel 2.4.18-10smp without problem to make POP3 server, with Courier IMAP 1.6.2 and NetApp Filer F760 as NFS server.We have upgrade one server with latest kernel without changing parameter. And the load average are high. Top give us these information: 2.4.18-10: 4:51pm up 2:49, 1 user, load average: 1.02, 1.14, 1.08 113 processes: 109 sleeping, 4 running, 0 zombie, 0 stopped CPU0 states: 5.1% user, 4.3% system, 0.1% nice, 89.3% idle CPU1 states: 4.1% user, 6.4% system, 0.0% nice, 88.3% idle Mem: 2065192K av, 717504K used, 1347688K free, 0K shrd, 77308K buff Swap: 2097112K av, 0K used, 2097112K free 502364K cached 2.4.18-19.7.x 4:51pm up 2 days, 2:00, 1 user, load average: 3.77, 3.07, 4.76 107 processes: 106 sleeping, 1 running, 0 zombie, 0 stopped CPU0 states: 5.4% user, 7.0% system, 0.0% nice, 86.4% idle CPU1 states: 5.3% user, 8.0% system, 0.0% nice, 86.0% idle Mem: 2064880K av, 2047500K used, 17380K free, 0K shrd, 87404K buff Swap: 2097112K av, 0K used, 2097112K free 1782876K cached We can see that the load is 3 time higher and the memory is heavy used on the 19.7.x kernel.You need to do a top and hit "M" to see which processes are using the most memory. If they aren't necessary, disable their startup. Also look at "vmstat 5 10" output and see if the "so" column reliably stays above 0. If it does, your machine is swapping, and needs more memory. You can _never_ look at used memory/swap as a sign of performance trouble, btw. Memory, and swap usage, no matter how much memory you have, should approach ~98% usage and almost _never_ go back down. Only active swapping indicates a memory shortage.
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