On 5 Mar 2010, at 18:34, eric.hagb...@morganstanley.com wrote:
This took a little longer to set up than I'd hoped, as 1.5.72
doesn't work under RHEL4 (the platform on which I was doing most of
my tests), due to the lack of zero_user_segments and page_offset in
the compiled kernel module.
Okay, I should fix both of these (I think they're both my fault).
However, the results running 1.5.72 on a RHEL5 system are pretty
much the same as with 1.4.x (where x is greater than or equal to 2),
wrt system time creep.
One thing I'd noticed in RHEL4 tests (systemtap doesn't seem to give
the same result under RHEL5) is that the system time usage
corresponds to high frequencies of calling afs_ComputePAGStats.
Compiling with AFS_NOSTATS defined or commenting out the section of
code in src/afs/afs_user.c that calls afs_ComputePAGStats also
relieves the problem.
Just to be clear here, are you seeing a high number of calls to
afs_ComputePAGStats, or a large amount of system time spent in that
function?
I can't see a call to afs_ComputePAGStats in afs_user.c - are you just
commenting out the body of the function, or is there a call site that
I am missing?
Cheers,
Simon.
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