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authorHeiko Carstens <heiko.carstens@de.ibm.com>2005-07-27 11:45:00 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-07-27 16:26:04 -0700
commit99b2d8df1d06f1072a949fc1e01a08b94b084d5f (patch)
treee5be46e9fbee8b68ab1743ef29037c0596a7265f /arch/s390/kernel/head.S
parent46ee058cdb3abab9313cc9cb9e9927d7672a718c (diff)
[PATCH] s390: external call performance
The kernel uses the SIGP external call order code to signal other CPUs. When running with dedicated CPUs external calls don't get delivered immediately but within a fixed polling invervall. This can lead to delays where the system appears to do nothing. Replace the SIGP external call order with the SIGP emergency call order since this one gets delivered immediately. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/s390/kernel/head.S')
-rw-r--r--arch/s390/kernel/head.S2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/kernel/head.S b/arch/s390/kernel/head.S
index fc8bf5e285f6..928ca65e8bb2 100644
--- a/arch/s390/kernel/head.S
+++ b/arch/s390/kernel/head.S
@@ -765,7 +765,7 @@ _stext: basr %r13,0 # get base
# check control registers
stctl %c0,%c15,0(%r15)
- oi 2(%r15),0x20 # enable sigp external interrupts
+ oi 2(%r15),0x40 # enable sigp emergency signal
oi 0(%r15),0x10 # switch on low address protection
lctl %c0,%c15,0(%r15)