Re: swappiness of 2.6 kernel
On Tue, 5 Aug 2008, thveillon.debian wrote:
On a Desktop workstation (multimedia edit, 4Gb ram, timer freq being set @
1000HZ) I've been using 20 for a long time, no problem whatsoever and no
swapping at all.
From my understanding for a server you need something closer or equal to 100,
for a workstation anything between 0 and 20 will do, anyway if swapping must
occur it will and the settings will be overridden, but no "provisional"
swapping (that's my word, not sure it makes sens...) will occur, resulting in
a more responsive experience especially when coming back to an application
left idle for a while.
That's my experience, and therefore my 2 cents...
Tom
Tom,
That is about what I was thinking. Since this is a mail server it would
seem like a disk cache is not a big deal. This being all the disk access
is mostly mail files coming in. But you do need a bunch free memory for
programs, very memory hungry program, involved in processing incoming
mail.
So far the 80 setting has freed up some free memory for use. What I can't
understand is why this 76k of swap memory keeps getting used. I'll clear
it out and then couple of hours later there it is again. Anyway here is a
snap shot of the current top:
Ken
top - 06:27:16 up 1 day, 20:15, 4 users, load average: 1.22, 1.03, 0.90
Tasks: 118 total, 1 running, 117 sleeping, 0 stopped, 0 zombie
Cpu0 : 0.7%us, 1.0%sy, 6.3%ni, 92.1%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu1 : 1.6%us, 3.3%sy, 24.3%ni, 57.2%id, 12.8%wa, 0.3%hi, 0.3%si, 0.0%st
Mem: 3927348k total, 3520456k used, 406892k free, 277516k buffers
Swap: 5076532k total, 76k used, 5076456k free, 2126116k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
28287 clamav 20 0 437m 260m 1232 S 0 6.8 14:15.51 clamav-milter
28066 clamav 20 0 102m 86m 720 S 0 2.3 0:31.62 clamd
20863 root 37 17 106m 74m 2432 S 13 1.9 0:04.76 spamd
21252 smithj 37 17 103m 71m 2408 S 17 1.9 0:01.86 spamd
21395 root 37 17 102m 70m 2320 S 0 1.8 0:00.32 spamd
4970 root 37 17 100m 68m 2180 S 0 1.8 1:28.18 spamd
2505 root 20 0 246m 68m 804 S 1 1.8 14:30.21 milter-greylist
2500 dcc 20 0 67132 9280 1288 S 0 0.2 1:08.84 dccifd
442 root 20 0 39296 4180 1984 S 0 0.1 0:00.00 sendmail-mta
28692 root 20 0 39272 4124 1928 S 0 0.1 0:00.00 sendmail-mta
865 root 20 0 39272 4092 1928 S 0 0.1 0:00.00 sendmail-mta
11537 root 20 0 39272 4092 1928 S 0 0.1 0:00.00 sendmail-mta
25395 root 20 0 39272 4092 1928 S 0 0.1 0:00.00 sendmail-mta
19006 root 20 0 39272 4080 1940 S 0 0.1 0:00.00 sendmail-mta
20825 root 20 0 39272 4080 1928 S 0 0.1 0:00.00 sendmail-mta
21420 root 20 0 39272 4072 1944 S 0 0.1 0:00.00 sendmail-mta
19220 root 20 0 39004 4008 1876 S 0 0.1 0:00.00 sendmail-mta
etc.....
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