Re: [gentoo-server] strange bogomips difference

[Andrea Ferraris]

----- Original Message ----- 
From: "Marko McLion" <mclion@×××××.net>
To: <gentoo-server@l.g.o>
Sent: Tuesday, January 20, 2004 12:53 PM
Subject: [gentoo-server] strange bogomips difference


> Hi
>
> We've recently purcased a new 2cpu server and installer gentoo on it. It's
a
> dual Athlon MP2800. All came smooth, but when the load of the server grew
and
> mysql got to 180 queries/sec it started to die (mysql daemon). We tried
> everything, even the binary distribution from mysql.com and lowering the
> maxconnections settings, but with no success... Then we've noticed that
gcc
> while compiling the last mysql sources died with a strange error, that
says
> in brief that there is a hardware error maybe... So we've checked the
machine
> (hardware) and found this:
> -----------
> $ cat /proc/cpuinfo
> processor       : 0
> vendor_id       : AuthenticAMD
> cpu family      : 6
> model           : 10
> model name      : AMD Athlon(tm) MP 2800+
> stepping        : 0
> cpu MHz         : 2133.380
> cache size      : 512 KB
> 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 mmx fxsr sse syscall mp mmxext 3dnowext 3dnow
> bogomips        : 4194.30
>
> processor       : 1
> vendor_id       : AuthenticAMD
> cpu family      : 6
> model           : 10
> model name      : AMD Athlon(tm) MP
> stepping        : 0
> cpu MHz         : 2133.380
> cache size      : 512 KB
> 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 mmx fxsr sse syscall mp mmxext 3dnowext 3dnow
> bogomips        : 4259.84
>
> ---------
>
> As you can see, the model name is displayed differently by the cpus and
the
> bogomips is different too.. Could be this the problem?
>
> We've disasembled the server and to the naked eye the cpu-s look the same.
It
> is possible that there is so much difference? Or is it a software problem?

Once upon a time, a smp kernel could run also on non smp machine.
Can you try to take away one CPU, then test the machine, compiling
the mysql sources, then if you get the same error, repeat with the other
CPU in the other slot, taking away the one you tested before.
Which is the strange gcc error that you get, compiling the mysql sources?
Isnt' it a sig 11? In such case could be a memory problem.

Andrea