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vswap question - physpages/oomguarpages [message #46881] Thu, 21 June 2012 04:44 Go to previous message
Rene Dokbua is currently offline  Rene Dokbua
Messages: 24
Registered: May 2012
Junior Member
I just noticed a couple of containers on one of our vswap enabled servers
have non-zero failcnt's (user_beancounters)

uid resource held maxheld
barrier limit failcnt
physpages 84873 131166
0 131072 61
oomguarpages 94628 377952
0 9223372036854775807 4
physpages 52986 262155
0 262144 1378
oomguarpages 57155 376725
0 9223372036854775807 18

(I've deleted lines with zero failcnt for clarity)

It was my understanding that if a vswap enabled container try to use more
physpages than available it would start "vswapping" - is that what happens
here? Otherwise how can physpages fail? Is this normal swapping behavior
or a problem?

A second thing is, when I tried to raise the physpages value with vzctl it
again wrote the old "block" values into the vz conf files, i.e.

i.e. before running vzctl the values are like this:
< PHYSPAGES="0:512M"
< SWAPPAGES="0:1024M"

after running vzctl --set 1413 --save --ram 512M --swap 1G the values are
like this:
> PHYSPAGES="0:131072"
> SWAPPAGES="0:262144"

I already opened a bug report on this and I though it had been fixed
already. Is there some undocumented flag that needs to be provided to
vzctl to get it to write out the values in the easy human readable format?

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