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Re: Wierd context-switching issue on Xeon

From: "Anjan Dave" <adave(at)vantage(dot)com>
To: Dirk Lutzeb├Ąck <lutzeb(at)aeccom(dot)com>,"Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "Josh Berkus" <josh(at)agliodbs(dot)com>
Cc: <pgsql-performance(at)postgreSQL(dot)org>,"Neil Conway" <neilc(at)samurai(dot)com>
Subject: Re: Wierd context-switching issue on Xeon
Date: 2004-04-20 16:48:58
Message-ID: 4BAFBB6B9CC46F41B2AD7D9F4BBAF78509814A@vt-pe2550-001.vantage.vantage.com (view raw or flat)
Thread:
Lists: pgsql-performance
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 Lutzeb├Ąck [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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Subject: Re: Wierd context-switching issue on Xeon
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