[OpenAFS-devel] read performance 1.5.74 Linux

[Hartmut Reuter]

I have now ported AFS/RXOSD to 1.5.74.
I am testing the client against servers running 1.4.12-osd.

My client configuration is memcache with chunksize 18 (256K).
Writing to the fileserver and also to the rxosd is as fast as with the 1.4.12
client (I am testing on my laptop with the whole test-cell in the laptop, so 30
MB/s is already an acceptable value).

But reading large files is terribly slow (~ 1 MB/s). With the 1.4.12 client read
and write have about the same speed.

with rxdebug -peer -long I can also see that some times in the rtt the
fileserver or rxosd see is growing up to several seconds and then again going
down to a ms. So there seems to be something strange in the rx-layer.
It also shows a lot of resends (about 1 %).

Any idea?

Hartmut
-----------------------------------------------------------------
Hartmut Reuter                  e-mail 		reuter@rzg.mpg.de
			   	phone 		 +49-89-3299-1328
			   	fax   		 +49-89-3299-1301
RZG (Rechenzentrum Garching)   	web    http://www.rzg.mpg.de/~hwr
Computing Center of the Max-Planck-Gesellschaft (MPG) and the
Institut fuer Plasmaphysik (IPP)
-----------------------------------------------------------------