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Hi guys,
I just found out... Installed 2.6.16.1 (32-bit) on a spanking new dual
opteron 275 (dual-core) machine, and saw that my link jobs were taking
ages.
I narrowed it down a bit - these are the kernels I have tested:
2.6.13.5: Good
2.6.14.7: Good
2.6.15: Poor
2.6.15.7: Poor
2.6.16.1: Poor
Sequential NFS I/O is good on all kernels. Only "ld" shows the problem.
On 2.6.14.7, I can run a large link job creating a 60 MB executable in
15.6 seconds wall-clock time.
On 2.6.15, the same link job takes 2 minutes 28 seconds.
This is almost 10 *times* longer.
Testing with tiobench, I can see no notable difference between the
kernels (!) It seems that this is very specific to ld. I am using GNU
ld version 2.15.
The NFS client mounts the working directory using NFS v3 over UDP with
default (32k) rsize/wsize.
Since this machine is not in production yet, I can experiment with
kernel patches on it - I would like to try and narrow this down even
further - any suggestions as to which patches to exclude/include will be
greatly appreciated.
Note; I did double-check all the common problems (ethernet problems,
mount options, ...).
--
/ jakob
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