netdev - Re: HTB accuracy for high speed

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Message-ID: <298f5c050905190608q442d0c81l19b1aa4e579a259@mail.gmail.com>
Date:	Tue, 19 May 2009 14:08:50 +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

Do I have that TSC problem?

On Tue, May 19, 2009 at 12:48 PM, Antonio Almeida <vexwek@...il.com> wrote:
>> 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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