Ubuntu Performance Question
Lennart Sorensen
lsorense-1wCw9BSqJbv44Nm34jS7GywD8/FfD2ys at public.gmane.org
Tue Jul 10 22:00:23 UTC 2007
On Tue, Jul 10, 2007 at 03:36:25PM -0400, lada-h8kxHjy+vg4AvxtiuMwx3w at public.gmane.org wrote:
> I migrated my Subversion server from a 800Mhz Pentium 3 with 512 MB of
> memory to a 3GHz Pentium 4 with 2 GB of memory. They both run Ubuntu 6.06
> LTS Linux (2.6.15-26-386 kernel).
> The P4 machine seems to be rather slow. Here is truncated output from top:
>
> top - 15:19:19 up 5 days, 22:43, 1 user, load average: 0.33, 0.09, 0.03
> Tasks: 56 total, 1 running, 55 sleeping, 0 stopped, 0 zombie
> Cpu(s): 4.2% us, 0.0% sy, 0.0% ni, 95.8% id, 0.0% wa, 0.0% hi, 0.0% si
> Mem: 2067576k total, 1474208k used, 593368k free, 213872k buffers
> Swap: 1951800k total, 18904k used, 1932896k free, 1167500k cached
>
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
>
> 15543 lsvatos 17 0 2196 1088 856 R 3.8 0.1 0:00.53 top
>
> And here from the P3 box:
>
> top - 15:17:07 up 19 days, 5:09, 1 user, load average: 0.00, 0.00, 0.00
> Tasks: 51 total, 1 running, 50 sleeping, 0 stopped, 0 zombie
> Cpu(s): 0.0% us, 0.3% sy, 0.0% ni, 99.7% id, 0.0% wa, 0.0% hi, 0.0% si
> Mem: 515284k total, 418848k used, 96436k free, 72740k buffers
> Swap: 979832k total, 18904k used, 960928k free, 262132k cached
>
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
>
> 9848 lsvatos 16 0 2192 1076 856 R 0.3 0.2 0:00.16 top
>
> How is it possible for the same program to consume 10 times the CPU time?
> I would appreciate any suggestions.
Not having DMA enabled for disk access can cause quite a severe cpu hit.
What does dmesg say on both?
--
Len Sorensen
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