Messages in this thread | | | Subject | Re: Memory pressure handling with iSCSI | From | Badari Pulavarty <> | Date | Tue, 26 Jul 2005 13:37:36 -0700 |
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On Tue, 2005-07-26 at 15:31 -0400, Sonny Rao wrote: > 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. >
My machine is AMD64.
- Badari
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