Re: Memory pressure handling with iSCSI

[Badari Pulavarty <pbadari@us.ibm.com>]

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On Tue, 2005-07-26 at 15:10 -0700, Andrew Morton wrote:
> Badari Pulavarty <pbadari@us.ibm.com> wrote:
> >
> > On Tue, 2005-07-26 at 14:24 -0700, Andrew Morton wrote:
> > > Badari Pulavarty <pbadari@us.ibm.com> wrote:
> > > >
> > > > ext2 is incredibly better. Machine is very responsive. 
> > > > 
> > > 
> > > OK.  Please, always monitor and send /proc/meminfo.  I assume that the
> > > dirty-memory clamping is working OK with ext2 and that perhaps it'll work
> > > OK with ext3/data=writeback.
> > 
> > Nope. Dirty is still very high..
> 
> That's a relief in a way.  Can you please try decreasing the number of
> filesystems now?

Here is the data with 5 ext2 filesystems. I also collected /proc/meminfo
every 5 seconds. As you can see, we seem to dirty 6GB of data in 20
seconds of starting the test. I am not sure if its bad, since we have
lots of free memory..

Thanks,
Badari



[-- Attachment #2: vmstat-5-ext2.out --]
[-- Type: text/plain, Size: 969 bytes --]

procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy id wa
 2 11    120  32912  10624 6813476    0    0     0  6766 10364   485  0  4  0 96
 0 11    120  33036  10652 6813964    0    0     2  8889 10079   475  0  4  0 96
 0 11    120  33036  10712 6813904    0    0     0  8077 9984   469  0  4  0 96
 0 11    120  32912  10752 6814380    0    0     0 15576 10226   514  0  4  0 95
 0 11    120  33036  10668 6813432    0    0     0 11334 10112   488  0  4  0 96
 0 11    120  33656  10600 6813500    0    0     0 11811 10238   497  0  4  0 96
 0 11    120  33036  10596 6814020    0    0     0 12713 10191   489  0  4  0 96
 0 11    120  33036  10648 6813968    0    0     1 15775 10195   508  0  4  0 96
 0 10    120  33780  10656 6812928    0    0     2  5390 10265   503  0  3  5 92
 0 11    120  33036  10660 6813440    0    0     0  9700 10217   518  0  4  2 94



[-- Attachment #3: meminfo.out --]
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