Ubuntu Performance Question

[lada-h8kxHjy+vg4AvxtiuMwx3w at public.gmane.org]

>On Tue, Jul 10, 2007 at 03:36:25PM -0400, lada at agawa.com 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?

[17179592.676000] scsi1 : ata_piix
[17179592.676000]   Vendor: ATA       Model: ST380013AS        Rev: 3.05
[17179592.676000]   Type:   Direct-Access                      ANSI SCSI
revision: 05
[17179592.680000]   Vendor: ATA       Model: ST380013AS        Rev: 3.05
[17179592.680000]   Type:   Direct-Access                      ANSI SCSI
revision: 05
[17179593.160000] Driver 'sd' needs updating - please use bus_type methods
[17179593.376000] SCSI device sda: 156301488 512-byte hdwr sectors (80026
MB)
[17179593.376000] SCSI device sda: drive cache: write back
[17179593.456000] SCSI device sda: 156301488 512-byte hdwr sectors (80026
MB)
[17179593.456000] SCSI device sda: drive cache: write back
[17179593.456000]  sda: sda1 sda2 sda3
[17179593.664000] sd 0:0:0:0: Attached scsi disk sda
[17179593.664000] SCSI device sdb: 156301488 512-byte hdwr sectors (80026
MB)
[17179593.664000] SCSI device sdb: drive cache: write back
[17179593.744000] SCSI device sdb: 156301488 512-byte hdwr sectors (80026
MB)
[17179593.744000] SCSI device sdb: drive cache: write back
[17179593.744000]  sdb: sdb1 sdb2 sdb3

>--
>Len Sorensen
>--
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