|author||David Daney <firstname.lastname@example.org>||2010-02-04 11:31:49 -0800|
|committer||Ralf Baechle <email@example.com>||2010-02-27 12:53:42 +0100|
MIPS: Optimize spinlocks.
The current locking mechanism uses a ll/sc sequence to release a spinlock. This is slower than a wmb() followed by a store to unlock. The branching forward to .subsection 2 on sc failure slows down the contended case. So we get rid of that part too. Since we are now working on naturally aligned u16 values, we can get rid of a masking operation as the LHU already does the right thing. The ANDI are reversed for better scheduling on multi-issue CPUs On a 12 CPU 750MHz Octeon cn5750 this patch improves ipv4 UDP packet forwarding rates from 3.58*10^6 PPS to 3.99*10^6 PPS, or about 11%. Signed-off-by: David Daney <firstname.lastname@example.org> To: email@example.com Patchwork: http://patchwork.linux-mips.org/patch/937/ Signed-off-by: Ralf Baechle <firstname.lastname@example.org>
Diffstat (limited to 'arch/mips/Kconfig.debug')
0 files changed, 0 insertions, 0 deletions