From: Christian Borntraeger <borntraeger@de.ibm.com>
To: "Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>
Cc: KVM <kvm@vger.kernel.org>, Cornelia Huck <cohuck@redhat.com>,
Christian Borntraeger <borntraeger@de.ibm.com>,
linux-s390 <linux-s390@vger.kernel.org>,
Janosch Frank <frankja@linux.vnet.ibm.com>,
David Hildenbrand <david@redhat.com>,
Wei Yongjun <weiyongjun1@huawei.com>
Subject: [GIT PULL 2/2] KVM: s390: change default halt poll time to 50us
Date: Mon, 20 May 2019 12:30:55 +0200 [thread overview]
Message-ID: <20190520103055.246818-3-borntraeger@de.ibm.com> (raw)
In-Reply-To: <20190520103055.246818-1-borntraeger@de.ibm.com>
Recent measurements indicate that using 50us results in a reduced CPU
consumption, while still providing the benefit of halt polling. Let's
use 50us instead.
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Janosch Frank <frankja@linux.ibm.com>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
---
arch/s390/include/asm/kvm_host.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index bdbc81b5bc91..2b00a3ebee08 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -36,7 +36,7 @@
*/
#define KVM_NR_IRQCHIPS 1
#define KVM_IRQCHIP_NUM_PINS 4096
-#define KVM_HALT_POLL_NS_DEFAULT 80000
+#define KVM_HALT_POLL_NS_DEFAULT 50000
/* s390-specific vcpu->requests bit members */
#define KVM_REQ_ENABLE_IBS KVM_ARCH_REQ(0)
--
2.21.0
next prev parent reply other threads:[~2019-05-20 10:30 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-20 10:30 [GIT PULL 0/2] KVM: s390: Fixes for 5.2-rc2 Christian Borntraeger
2019-05-20 10:30 ` [GIT PULL 1/2] KVM: s390: fix typo in parameter description Christian Borntraeger
2019-05-20 10:30 ` Christian Borntraeger [this message]
2019-05-20 10:40 ` [GIT PULL 0/2] KVM: s390: Fixes for 5.2-rc2 Paolo Bonzini
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