[Bug nptl/4274] Performance issue: pthread_cond_signal() causes three context switches instead of one

["bart dot vanassche at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

------- Additional Comments From bart dot vanassche at gmail dot com  2007-03-25 15:28 -------
Are you sure that this is already fixed ? These are the results with the latest
CVS version (2007-03-25):

$ /home/bart/glibc-cvs/lib/libc.so.6
GNU C Library development release version 2.5.90, by Roland McGrath et al.
Copyright (C) 2007 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
Compiled by GNU CC version 4.1.2 20061115 (prerelease) (SUSE Linux).
Compiled on a Linux >>2.6.18.6<< system on 2007-03-25.
Available extensions:
        crypt add-on version 2.1 by Michael Glad and others
        Native POSIX Threads Library by Ulrich Drepper et al
        BIND-8.2.3-T5B
For bug reporting instructions, please see:
<http://www.gnu.org/software/libc/bugs.html>.

$ LD_LIBRARY_PATH=/home/bart/glibc-cvs/lib:
/home/bart/glibc-cvs/lib/ld-linux.so.2 ./glibc-cvs-condvar-perf
NPTL
mutex                   elapsed:     4054 us; per iteration:   40 ns / 5e-05 csw
c.v. ping-pong test     elapsed:   421526 us; per iteration: 4215 ns / 6 csw
signal ping-pong test   elapsed:   430622 us; per iteration: 4306 ns / 4 csw
signal ping-pong no mtx elapsed:   207861 us; per iteration: 2078 ns / 2 csw


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |


http://sourceware.org/bugzilla/show_bug.cgi?id=4274

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