From: Cornelia Huck <cornelia.huck@de.ibm.com>
To: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: "Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>, KVM <kvm@vger.kernel.org>,
linux-s390 <linux-s390@vger.kernel.org>,
"David Matlack" <dmatlack@google.com>,
"Wanpeng Li" <kernellwp@gmail.com>
Subject: Re: [PATCH 1/1] KVM: shrink halt polling even more for invalid wakeups
Date: Tue, 17 May 2016 19:00:51 +0200 [thread overview]
Message-ID: <20160517190051.5f58e57d.cornelia.huck@de.ibm.com> (raw)
In-Reply-To: <1463474962-5941-2-git-send-email-borntraeger@de.ibm.com>
On Tue, 17 May 2016 10:49:22 +0200
Christian Borntraeger <borntraeger@de.ibm.com> wrote:
> commit 3491caf2755e ("KVM: halt_polling: provide a way to qualify
> wakeups during poll") added more aggressive shrinking of the
> polling interval if the wakeup did not match some criteria. This
> still allows to keep polling enabled if the polling time was
> smaller that the current max poll time (block_ns <= vcpu->halt_poll_ns).
> Performance measurement shows that even more aggressive shrinking
> (shrink polling on any invalid wakeup) reduces absolute and relative
> (to the workload) CPU usage even further.
>
> Cc: David Matlack <dmatlack@google.com>
> Cc: Wanpeng Li <kernellwp@gmail.com>
> Cc: Radim Krčmář <rkrcmar@redhat.com>
> CC: Paolo Bonzini <pbonzini@redhat.com>
> CC: Cornelia Huck <cornelia.huck@de.ibm.com>
> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
> ---
> virt/kvm/kvm_main.c | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
prev parent reply other threads:[~2016-05-17 17:10 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-17 8:49 [PATCH 0/1] KVM: more halt polling Christian Borntraeger
2016-05-17 8:49 ` [PATCH 1/1] KVM: shrink halt polling even more for invalid wakeups Christian Borntraeger
2016-05-17 13:54 ` Christian Borntraeger
2016-05-17 16:43 ` Paolo Bonzini
2016-05-17 17:00 ` Cornelia Huck [this message]
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