netdev - Re: HTB accuracy for high speed

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Date:	Tue, 19 May 2009 12:48:18 +0100
From:	Antonio Almeida <vexwek@...il.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	netdev@...r.kernel.org, jarkao2@...il.com, kaber@...sh.net,
	davem@...emloft.net, devik@....cz,
	Eric Dumazet <dada1@...mosbay.com>
Subject: Re: HTB accuracy for high speed

> Are you using one of the AMD dual core machines?  That processor has the bad
> design flaw that the TSC counter is not synced between core's so the kernel can't
> use it. You might even be better off running a non SMP kernel on that box.

My machine has two dual cores AMD Opteron processor 280. Do I have
that TSC problem.


# dmesg | grep AMD
OEM ID: AMD      Product ID: HAMMER       APIC at: 0xFEE00000
CPU0: AMD Dual Core AMD Opteron(tm) Processor 280 stepping 02
CPU1: AMD Dual Core AMD Opteron(tm) Processor 280 stepping 02
CPU2: AMD Dual Core AMD Opteron(tm) Processor 280 stepping 02
CPU3: AMD Dual Core AMD Opteron(tm) Processor 280 stepping 02


processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 15
model           : 33
model name      : Dual Core AMD Opteron(tm) Processor 280
stepping        : 2
cpu MHz         : 2394.039
cache size      : 1024 KB
physical id     : 0
siblings        : 2
core id         : 0
cpu cores       : 2
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext
fxsr_opt lm 3dnowext 3dnow pni lahf_lm cmp_legacy ts fid vid ttp
bogomips        : 4790.36
clflush size    : 64


  Antonio Almeida
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