Re: ext3 performance inconsistencies, 2.4/2.6

[Ulrich Drepper]

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Linus Torvalds wrote:

> Is the TLS stuff done through an extra dynamically loaded indirection or
> something?

This has nothing to do with TLS.  The code currently used got to use the
general libpthread locking code.  This was, I think, the result of one
of the last changes in the locking code where the libc side wasn't
updated correctly.  I've done this and this is what I see:

drepper@ht 20031104-2$ time ./u > /dev/null
real    0m1.272s
user    0m1.270s
sys     0m0.000s

drepper@ht 20031104-2$ time LD_ASSUME_KERNEL=2.4.1 ./u > /dev/null
real    0m0.316s
user    0m0.320s
sys     0m0.000s

drepper@ht 20031104-2$ time LD_LIBRARY_PATH=. ./u > /dev/null
real    0m0.207s
user    0m0.210s
sys     0m0.000s



The first is the old nptl code, the second LinuxThreads, the third the
current nptl code.

- -- 
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Ulrich Drepper \    ,-----------------'   \ Mountain View, CA 94041 USA
Red Hat         `--' drepper at redhat.com `---------------------------
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