[OpenAFS] Speed of Windows Client 1.4.0RC7

[Jeffrey Altman]

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Lars Schimmer wrote:
> Hi!
> 
> Just a quick question:
> I installed a windows 1.4.0RC7 OpenAFS Client and a 1.4 RC4 fileserver
> on Linux, both connected via a 100 MBit network. But upload via AFS just
> reach 3 MB/sec and the CPU of the client is under heavy load.
> From linux 1.4.0RC4 Clients I get 8-9 MB/sec.
> Is that the limitation of the smb usage? Any hints for me to get more
> speed? Will a switch to GBit extend the speed (although I don't believe
> in this)?

OAFW defaults to using "fs crypt on".   Linux does not.   If you are
testing performance by copying a single file back and forth you are
limited by the fact that only a single RX call will be used to send
blocks at a time.   There is a limit a four simultaneous RX calls at
a time for the same set of credentials (RX connection) to the same
server.   You can use more bandwidth by transfering multiple files to
multiple servers or with multiple user tokens.

> And as release notes tells me, windows client doesn't support files >2
> GB, I can copy files with 5 GB without any problems to afs and from afs...

There is no support in the version of the SMB/CIFS protocol for
representing file sizes greater than 2GB.   There is support in the
cache manager for greater than 2GB.   However, I wouldn't trust the
contents.

Jeffrey Altman

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