Re: Wierd context-switching issue on Xeon

If this helps -

Quad 2.0GHz XEON with highest load we have seen on the applications, DB performing great -

procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
1 0 0 1616 351820 66144 10813704 0 0 2 0 1 1 0 2 7
3 0 0 1616 349712 66144 10813736 0 0 8 1634 1362 4650 4 2 95
0 0 0 1616 347768 66144 10814120 0 0 188 1218 1158 4203 5 1 93
0 0 1 1616 346596 66164 10814184 0 0 8 1972 1394 4773 4 1 94
2 0 1 1616 345424 66164 10814272 0 0 20 1392 1184 4197 4 2 94

Around 4k CS/sec
Chipset is Intel ServerWorks GC-HE.
Linux Kernel 2.4.20-28.9bigmem #1 SMP

Thanks,
Anjan

-----Original Message-----
From: Dirk Lutzebäck [mailto:lutzeb(at)aeccom(dot)com]
Sent: Tuesday, April 20, 2004 10:29 AM
To: Tom Lane; Josh Berkus
Cc: pgsql-performance(at)postgreSQL(dot)org; Neil Conway
Subject: Re: [PERFORM] Wierd context-switching issue on Xeon

Dirk Lutzebaeck wrote:

> c) Dual XEON DP, non-bigmem, HT on, E7500 Intel chipset (Supermicro)
>
> performs well and I could not observe context switch peaks here (one
> user active), almost no extra semop calls

Did Tom's test here: with 2 processes I'll reach 200k+ CS with peaks to
300k CS. Bummer.. Josh, I don't think you can bash the ServerWorks
chipset here nor bigmem.

Dirk

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