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    SubjectRe: Memory pressure handling with iSCSI
    On Tue, Jul 26, 2005 at 11:39:11AM -0700, Badari Pulavarty wrote:
    > On Tue, 2005-07-26 at 11:11 -0700, Andrew Morton wrote:
    > > Badari Pulavarty <pbadari@us.ibm.com> wrote:
    > > >
    > > > After KS & OLS discussions about memory pressure, I wanted to re-do
    > > > iSCSI testing with "dd"s to see if we are throttling writes.
    > > >
    > > > I created 50 10-GB ext3 filesystems on iSCSI luns. Test is simple
    > > > 50 dds (one per filesystem). System seems to throttle memory properly
    > > > and making progress. (Machine doesn't respond very well for anything
    > > > else, but my vmstat keeps running - 100% sys time).
    > >
    > > It's important to monitor /proc/meminfo too - the amount of dirty/writeback
    > > pages, etc.
    > >
    > > btw, 100% system time is quite appalling. Are you sure vmstat is telling
    > > the truth? If so, where's it all being spent?
    > >
    > >
    >
    > Well, profile doesn't show any time in "default_idle". So
    > I believe, vmstat is telling the truth.

    Badari,

    You probably covered this, but just to make sure, if you're on a
    pentium4 machine, I usually boot w/ "idle=poll" to see proper idle
    reporting because otherwise the chip will throttle itself back and
    idle time will be skewed -- at least on oprofile.

    Sonny
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