From owner-freebsd-smp@FreeBSD.ORG  Fri Apr 25 00:24:52 2003
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From: Soeren Schmidt <sos@spider.deepcore.dk>
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To: jeev <jeev@boldinternet.net>
Date: Fri, 25 Apr 2003 09:24:46 +0200 (CEST)
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cc: freebsd-smp@FreeBSD.ORG
Subject: Re: Dual 2.40ghz xeon w/hyperthreading
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It seems jeev wrote:
> Basically guys, this box is not exceeding an ide computer I have on idea.
> 
> I noticed the dual xeon to be slow. So I ran:
> 
> dd if=/dev/urandom of=/dev/null bs=1m count=1024
> 
> on 2 servers, 1 is the top one and 1 is the xeon.
> Obviously the ide killed the scsi with dual cpu's running hyperthreading,
> why?
> 
> 
> -SINGLE 2.4ghz p4 w/1gb ram and 80gig ide
> 
> 1073741824 bytes transferred in 266.387823 secs (4030747 bytes/sec)
> 2.4ghz
> CPU: Intel(R) Pentium(R) 4 CPU 2.40GHz (2399.74-MHz 686-class CPU)
>   Origin = "GenuineIntel"  Id = 0xf27  Stepping = 7
>  
> Features=0xbfebf9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV
> ,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
> real memory  = 1073676288 (1048512K bytes)
> avail memory = 1039519744 (1015156K bytes)
> ad0: 76319MB <WDC WD800JB-00DUA1> [155061/16/63] at ata0-master UDMA100

Hmm something is strange here on a semilar system:

CPU: Intel(R) Pentium(R) 4 CPU 2.40GHz (2399.74-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0xf27  Stepping = 7
  Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,C
MOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
real memory  = 1073725440 (1023 MB)
avail memory = 1037553664 (989 MB)

Running FreeBSD 5.0-CURRENT #0: Thu Apr 24 15:36:12 CEST 2003
    sos@devel.deepcore.dk:/develop/ata-ng/sys/i386/compile/DEVEL

I get this:
devel> dd if=/dev/urandom of=/dev/null bs=1m count=1024
1024+0 records in
1024+0 records out
1073741824 bytes transferred in 56.858569 secs (18884433 bytes/sec)
devel> 

-Søren