Date: Tue, 14 Apr 1998 15:49:35 +0400 From: "Alexander B. Povolotsky" <root@asteroid.svib.ru> To: hackers@FreeBSD.ORG Cc: smp@FreeBSD.ORG Subject: SMP performance decrease? Message-ID: <199804141149.PAA19398@asteroid.svib.ru>
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Hello! I've just benchmarked (by bytebench from ports) my new server, with 64M RAM (for now; will increase soon) and 2 PII-233 processors (EliteGroup p6LX2-A mainboard). Here are the results: Test Non-SMP SMP arith (double) 27.5 28.1 Drystone 2 (no reg. vars) 23.6 24.1 Execl thoughput 90.8 46.8 <- ??? File copy 35.1 37.7 Pipe-based context switching 20.4 9.0 <- ??? Shell scripts (8 concurrent) 12.8 12.2 <- ??? I don't understand why execl throughput and context switching is TWICE slower in SMP mode, and I doesn't understand AT ALL why shell script benchmark isn't twice faster. Wrong benchmark? Problems with something in kernel? Me being crazy? Alex. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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