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authorGautham R Shenoy <ego@in.ibm.com>2009-06-23 23:26:37 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-08-27 13:12:54 +1000
commit6776426320e151051a16bc7bf86f12d310c9e8ca (patch)
treee41bfd5e852c4751058aa5c7e61998880787ef08
parent6fdc31a2b86cf1f98e3eed896578ad9659eeb0f8 (diff)
downloadlinux-6776426320e151051a16bc7bf86f12d310c9e8ca.tar.bz2
powerpc/pseries: Reduce the polling interval in __cpu_up()
Time time taken for a single cpu online operation on a pseries machine is as follows: Dedicated LPAR (POWER6): ~220ms. Shared LPAR (POWER5) : ~240ms. Of this time, approximately 200ms is taken up by __cpu_up(). This is because we poll every 200ms to check if the new cpu has notified it's presence through the cpu_callin_map. We repeat this operation until the new cpu sets the value in cpu_callin_map or 5 seconds elapse, whichever comes earlier. However, using completion_structs instead of polling loops, the time taken by the new processor to indicate it's presence has found to be less than 1ms on pseries. This method however may not work on all powerpc platforms due to the time-base synchronization code. Keeping this in mind, we could reduce msleep polling interval from 200ms to 1ms while retaining the 5 second timeout. With this, the time taken for a cpu online operation changes as follows: Dedicated LPAR (POWER6): 20-25ms. Shared LPAR (POWER5) : 60-80ms. In both these cases, it was found that the code polls through the loop only once indicating that 1ms is a reasonable value, atleast on pseries. The code needs testing on other powerpc platforms. Signed-off-by: Gautham R Shenoy <ego@in.ibm.com> Acked-by: Joel Schopp <jschopp@austin.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
-rw-r--r--arch/powerpc/kernel/smp.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 0b47de07302d..96f107cc0160 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -412,9 +412,8 @@ int __cpuinit __cpu_up(unsigned int cpu)
* CPUs can take much longer to come up in the
* hotplug case. Wait five seconds.
*/
- for (c = 25; c && !cpu_callin_map[cpu]; c--) {
- msleep(200);
- }
+ for (c = 5000; c && !cpu_callin_map[cpu]; c--)
+ msleep(1);
#endif
if (!cpu_callin_map[cpu]) {