Hi.
Kris Kennaway wrote:
In the "good" case you are getting a much higher interrupt rate but
with the data you provided I can't tell where from. You need to run
vmstat -i at regular intervals (e.g. every 10 seconds for a minute)
during the "good" and "bad" times, since it only provides counters
and an average rate over the uptime of the system.
Now I'm running 10-process lighttpd and the problem became no so big.
I collected interrupt stats and it shows no relation beetween
ionterrupts and slowdowns. Here is it:
http://83.167.98.162/gprof/intr-graph/
Also I have similiar statistics on mutex profiling and it shows
there's no problem in mutexes.
http://83.167.98.162/gprof/mtx-graph/mtxgifnew/
I have no idea what else to check.
I don't know what this graph is showing me :) When precisely is the
system behaving poorly?
Take a look at "Disk Load %" picture at
http://83.167.98.162/gprof/intr-graph/
At ~ 17:00, 03:00-04:00, 13:00-14:00, 00:30-01:30, 11:00-13:00 it shows
peaks of disk activity which really never happen. As I said in the
beginning of the thread in this "peak" moments disk becomes slow and
vmstat shows 100% disk load while performing < 10 tps. Other grafs at
this page shows that there's no relation to interrupts rate of amr or em
device. You advised me to check it.
When I was using single-process lighttpd the problem was much harder as
you can see at http://83.167.98.162/gprof/graph/ . At first picture on
this page you can see disk load peaks at 18:00 and 15:00 which leaded to
decreasing network output because disk was too slow.
Back in this thread we suspected UMA mutexes. In order to check it I
collected mutex profiling stats and draw graphs over time and they also
didn't show anything interesting. All mutex graphs were smooth while
disk load peaks. http://83.167.98.162/gprof/mtx-graph/mtxgifnew/
With best regards,
Alexey Popov
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