Re: Is Tru64 actually faster
From: erik (erik_at_geenspam.vanwesten.net)
Date: 12/14/03
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Date: Sun, 14 Dec 2003 23:47:41 +0100
Peter da Silva wrote:
> In article <3fd1b773$0$210$e4fe514c@news.xs4all.nl>,
> erik <erik@geenspam.vanwesten.net> wrote:
>> For a nice comparison: I have two sendmail boxes (identical alpha's).
>> One is suffering from high load, the other is doing virually nothing.
>> The latter is running linux, and then even an old, not very good at
>> smp, kernel. Both boxes are treated equally by the loadbalancer.
>>
>> The true64 machine also could not cope well with large amounts of
>> files in the queues, where the linux machine had no problems at all.
>
> What file system are you using on the Tru64 box?
>
> Linux' file systems typically use a delayed write cache for
> everything, while Tru64 UFS uses write-through for metadata so if the
> system crashes the file system structure is intact, and Tru64 AdvFS is
> a log-based file system that periodically snapshots metadata in a
> checkpoint. For a mail spool that's creating and destroying a lot of
> small files in /var/spool/mqueue you're going to get much better
> performance from Linux' file system than UFS, and AdvFS may be better
> suited to the job... though I have had funny results from AdvFS in
> 5.1. Another option could be UFS with nosync.
>
We are using AdvFS on the tru64 box. In the end I gave higher priority
in the loadbalancer to the linux box. (10 for linux, 7 for true64 and 5
to the solaris boxes). That seems to work out better.
Be aware though that the linux box is running an old 2.2 kernel. That is
definately not the best of choices for smp. ext2fs on that kernel is
also not extremely performant to the current standards.
EJ
-- Remove the obvious part (including the dot) for my email address. http://www.vanwesten.net for examples of ipf and pf.
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