Re: Memory pressure handling with iSCSI

[Andrew Morton]

Badari Pulavarty <pbadari@xxxxxxxxxx> 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?

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