8.04 super slow on dell 2550

Sebastien Estienne sebastien.estienne at gmail.com
Mon Apr 27 18:31:18 UTC 2009


try benchmarking with a jaunty live cd mounting you hardy partition so  
you can test a newer kernel

--
Sebastien E.


Le 27 avr. 09 à 20:15, Jason Joines <joines at as.okstate.edu> a écrit :

>      I have a dell 2550 server that I want to get Ubuntu on.  I  
> tried a
> few months ago with the initial 8.04 release and the install was so  
> slow
> I gave up.  I had tried the mini.iso cd, desktop cd, server cd, and
> alternate cd with the same results.
>
>      Recently I decided to try again with the 8.04.2 media and just  
> let
> it keep running.  Instead of assuming it had timed out I would go  
> check
> on it once a day and after many days it was finally installed.  As an
> example of the slow install, when using the text install and at the
> point where the dialog said "Installing the base system" it took 66
> minutes to go from a 33% status to a 39% status.  Also, by watching  
> logs
> it seemed that the package retrieval from the internet was really fast
> but it became super slow any time it was "unpacking".
>
>      The system has a broadcom1 Gbps nic, two pentium III 933 cpu's, 1
> GB of RAM, three 74 GB u160 scsi drives configured as raid 0 via the
> builtin dell raid controller which is using the aacraid module.  I've
> tried both ext3 and xfs as the filesystem.
>
>      This system was running windows server 2k3 and wasn't noticeably
> slow.  I also have an identical system that is running Ubuntu 7.10 and
> it seems to be over three times as fast via these simple tests:
>
>      7.10 System running 2.6.22 kernel
> dd if=/dev/zero of=gigfile00 bs=1k count=1048576
> 1048576+0 records in
> 1048576+0 records out
> 1073741824 bytes (1.1 GB) copied, 29.5587 seconds, 36.3 MB/s
>
> dd if=/dev/zero of=gigfile00 bs=1M count=1024
> 1024+0 records in
> 1024+0 records out
> 1073741824 bytes (1.1 GB) copied, 29.1349 seconds, 36.9 MB/s
>
>      8.04.2 System running 2.6.24 kernel
> dd if=/dev/zero of=gigfile00 bs=1M count=1024
> 1024+0 records in
> 1024+0 records out
> 1073741824 bytes (1.1 GB) copied, 98.4516 s, 10.9 MB/s
>
> dd if=/dev/zero of=gigfile00 bs=1k count=1048576
> 1048576+0 records in
> 1048576+0 records out
> 1073741824 bytes (1.1 GB) copied, 93.9246 s, 11.4 MB/s
>
>
>      I found this bug report
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/249964 about  
> these
> smp systems having the aacraid driver hang under high load.  However,
> this box isn't under any load and I haven't had any of the log  
> messages
> reported.  I decided to try the fix anyway so I recompiled the kernel
> after changing:
> #define AAC_MAX_32BIT_SGBCOUNT  ((unsigned short)256)
> to
> #define AAC_MAX_32BIT_SGBCOUNT  ((unsigned short)127)
> in aacraid.  It didn't help.
>
>      I also tried disabling smp via "maxcpus=1" in grub.  It did  
> disable
> smp but it didn't help.
>
>      Any suggestions?
>
>
> Jason Joines
> =================================
>
>
>
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