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[PATCH] s390: external call performance

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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>
This commit is contained in:
Heiko Carstens
2005-07-27 11:45:00 -07:00
committed by Linus Torvalds
parent 46ee058cdb
commit 99b2d8df1d
4 changed files with 17 additions and 13 deletions
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2
arch/s390/kernel/head64.S
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@@ -762,7 +762,7 @@ _stext: basr %r13,0 # get base
# check control registers
stctg %c0,%c15,0(%r15)
oi 6(%r15),0x20 # enable sigp external interrupts
oi 6(%r15),0x40 # enable sigp emergency signal
oi 4(%r15),0x10 # switch on low address proctection
lctlg %c0,%c15,0(%r15)