[OpenAFS] speed of OpenAFS fileserver

[Lars Schimmer]

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Lars Schimmer wrote:
> Frank Burkhardt wrote:
>> Hi,
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>> On Sat, Feb 23, 2008 at 02:18:23PM +0100, Lars Schimmer wrote:
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>> [snip]
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>>> Is there any limit built in?
>>> Has anyone reached more than 10 MB/sec from debian filserver package?
>> Yes - we have :-) :
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>>   Reading a single large file: 55.5 MiB/s
>>   Writing a single large file: 63.5 MiB/s
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>> This is the configuration:
>>   * G33-DS3R mainboard
>>   * Intel Core2Quad Q6600 , 2.4GHz
>>   * 2GB of RAM
>>   * 1GBit/s ethernet
>>   * 10x 750 GB in a RAID-6 on an Areca 1231 controller
>>   * ext3 as /vicepa
>>   * Debian Etch + latest updates
>>   * Kernel is vanilla 2.6.23.8, results are nearly the same for 2.6.24=
.0
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>> The given performance values were measured between two of those server=
s
>> which were connected via a single low-cost GE-switch.
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> Did you make any special config line options to the filservers in BosCo=
nfig?
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> I tested right now with a temp fileserver on my workstation (debian
> kernel 2.6.21 and Athlon X2 6000+) and got rates above to 26 MB/sec to =
a
> windows 1.5.32 client.
> To one of my other servers I just get 8 MB /sec.
> To another linux athlon XP client I get 11 MB/Sec with a load of 40% fo=
r
> fileserver on the server.
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> Could it be a CPU/kernel issue?
> e.g. with kernel 2.6.21 >100MBit, with kernel <2.6.19 just 100MBit max?
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> And the load makes me wonder.
> On a 3 Ghz Xeon I get a load of 90% with 10 MB/sec (2.6.17 kernel), on =
a
> athlon 6000+ (3 Ghz) I get a load of 40% at 26 MB/sec (2.6.21 Kernel).
> Is the Xeon SO much worse? Or the old kernel?

Made some more tests.
Looks like software RAID snagging much much load from CPU and OpenAFS
fileserver can't send out much more.
I assumed load is distributed between both CPUs but looks like
interrupts and else are killing my performance.

> MfG,
> Lars Schimmer

MfG,
Lars Schimmer
- --
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TU Graz, Institut f=FCr ComputerGraphik & WissensVisualisierung
Tel: +43 316 873-5405       E-Mail: l.schimmer@cgv.tugraz.at
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