diff options
author | Cyrill Gorcunov <gorcunov@openvz.org> | 2011-05-19 23:45:49 (GMT) |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2011-05-20 11:41:09 (GMT) |
commit | 9d0fa6c5f43f2d9c6966dcab7af96a717682fdec (patch) | |
tree | e3fdd94ba55748fbfc41ad5e38c32169638f2091 /arch/x86/kernel/vmlinux.lds.S | |
parent | a39d1f3f67f6a3d72b24f0d8bf9a295a27ea448e (diff) | |
download | linux-fsl-qoriq-9d0fa6c5f43f2d9c6966dcab7af96a717682fdec.tar.xz |
x86, x2apic: Minimize IPI register writes using cluster groups
In the case of x2apic cluster mode we can group IPI register
writes based on the cluster group instead of individual per-cpu
destination messages.
This reduces the apic register writes and reduces the amount of
IPI messages (in the best case we can reduce it by a factor of
16).
With this change, the cost of flush_tlb_others(), with the flush
tlb IPI being sent from a cpu in the socket-1 to all the logical
cpus in socket-2 (on a Westmere-EX system that has 20 logical
cpus in a socket) is 3x times better now (compared to the former
'send one-by-one' algorithm).
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: steiner@sgi.com
Cc: yinghai@kernel.org
Link: http://lkml.kernel.org/r/20110519234637.512271057@sbsiddha-MOBL3.sc.intel.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/vmlinux.lds.S')
0 files changed, 0 insertions, 0 deletions