[OpenAFS] Re: Guidelines to speed up OpenAFS?

[Derrick Brashear]

On Fri, Jun 18, 2010 at 4:18 AM, Claudio Prono <claudio.prono@atpss.net> wrote:
>
>
> Andrew Deason ha scritto:
>
> On Thu, 17 Jun 2010 15:06:11 +0200
> Claudio Prono <claudio.prono@atpss.net> wrote:
>
>
>
> I have some problems of speed with AFS. I have a Intel Xeon 3.2 Ghz
> with 1 Gb of ram, Symbios Logic 53c1030 PCI-X Fusion-MPT Dual Ultra320
> SCSI (rev 07) and external array MSA500.
>
>
> Platform and OpenAFS version of server? Of the client? What's the
> connection between the server and client?
>
>
>
> OpenAFS 1.4.8 on OpenSuSE 11.0 for server

1.4.12 with jumbograms enabled (-jumbo) will perform better.

>
> Client VISTA/Seven with OpenAFS 1.5.71 for clients
>
> What parameters have you given to afsd and the fileserver? What cache
> size on the client?
>
>
>
> afsd -stat 300 -dcache 100 -daemons 2 -volumes 50 -memcache -dynroot -afsdb
>
> On Client the cache size is 98304 Kb, Chunk size is 256 Kb, Status Cache is
> 10000 Entries
>
> My average speed is 8 Mb/sec on write and something similar on read.
> Is a little slow with this performances. My question is, what i can
> try to make it more fast ? Any custom optimization, or something like
> this to solve my problem?
>
>
> I recall a while ago someone reporting a large performance increase by
> increasing -rxpck (on the client I think, but you could try the client
> and server, too). Try setting it to different values around the range
> 4000-10000 or higher, and see what happens. I think some of the recent
> RX changes improves this so you don't need such tweaking, but others may
> correct me.
>
> And, depending on the client version, the default chunksize may not be
> sane; try -chunksize 20. But not-old versions should get it right.
>
> If you provide the output of 'rxdebug <client> 7001 -rxstats' while
> you're reading or writing at a sustained 8Mbps-ish, it may indicate what
> is limiting you.
>
>
>
> How i can increase the -rxpck on the Client or the server? is not clear to
> me...

add the switch to the fileserver switches in the bos bnode.

> Sorry i don't understand how to provide the output of rxdebug...
>
> Cordially,
>
> Claudio Prono.
>
>
>
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>
>



-- 
Derrick