Also seeing 2 x quad-core system slower that 2 x dual core
max at love2party.net
Thu Nov 29 10:32:23 PST 2007
On Thursday 29 November 2007, Pete French wrote:
> I think I also just came up against the same effect that the original
> poster saw. I have two sets of machines here - one is a pair of dual
> core Xeons, the other a pair of quad core Xeons. They are HP servers,
> more or less identical apart from the processors I belive.
> Both have 7.0-BETA3 installed, and the same config on them with the
> same files. I am trying to delete a gigabyte of files using 'rm -rf'
> On the dual core processors this takes about 20 seconds. On the quad
> cores it takes about 3 minutes! This is true for both the 32 and 64 bit
> versions of FreeBSD :-(
Can you provide more details on this task? It seems like something that
could easily be reproduced in a lab environment and serve as a regression
test and baseline for future improvements. Is the server doing any other
work while doing the rm, or is this it? What kind of directory layout
are we looking at? How many files, directories, users ...? What type of
filesystem, options, size?
BTW, what's your nsswitch.conf like? If you don't need nis, removing it
can mean a considerable speed improvement - or try nscd(8).
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