From: Sheng Yang <sheng@linux.intel.com>
To: mtosatti@redhat.com
Cc: kvm@vger.kernel.org
Subject: Re: [patch 0/4] use smp_send_reschedule in vcpu_kick / assigned dev host intx race fix
Date: Tue, 28 Apr 2009 15:08:46 +0800 [thread overview]
Message-ID: <200904281508.47370.sheng@linux.intel.com> (raw)
In-Reply-To: <20090427210740.675732111@amt.cnet>
Ack all. This also solved one bug by my hand. Thanks!
I observe one point: the performance of high workload interrupt(e.g. 10
gigabyte oplin card) dropped dramatically with smp_send_reschedule() method...
In one environment(the speed of oplin card also limited by cpu performance),
Using smp_call_function_single() can get more than 1G bit/s stably(native got
1.2G), but smp_send_reschedule() can only got around 600M bit/s... And the
rescheduling interrupt number is about 2000/second per cpu. And the interrupt
rate is about tens of thousands per second for the device.
Anyway, this method is more elegant and correct. Though there is still room
for optimize - but of course, the correctness is first priority.
--
regards
Yang, Sheng
next prev parent reply other threads:[~2009-04-28 7:08 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-27 21:07 [patch 0/4] use smp_send_reschedule in vcpu_kick / assigned dev host intx race fix mtosatti
2009-04-27 21:07 ` [patch 1/4] qemu: external module: smp_send_reschedule compat mtosatti
2009-05-07 13:28 ` Avi Kivity
2009-04-27 21:07 ` [patch 2/4] KVM: x86: wake up waitqueue before calling get_cpu() mtosatti
2009-04-27 21:07 ` [patch 3/4] KVM: use smp_send_reschedule in kvm_vcpu_kick mtosatti
2009-04-27 21:07 ` [patch 4/4] KVM: protect assigned dev workqueue, int handler and irq acker mtosatti
2009-04-28 7:08 ` Sheng Yang [this message]
2009-04-29 17:47 ` [patch 0/4] use smp_send_reschedule in vcpu_kick / assigned dev host intx race fix Marcelo Tosatti
2009-04-30 0:56 ` Sheng Yang
2009-04-30 1:59 ` Sheng Yang
2009-05-06 5:07 ` Sheng Yang
2009-05-07 13:21 ` Avi Kivity
2009-05-07 20:55 ` [patch 0/4] smp_send_reschedule / assigned dev host intx race v2 mtosatti
2009-05-07 20:55 ` [patch 1/4] kvm-kmod: nr_cpu_ids compat mtosatti
2009-05-07 20:55 ` [patch 2/4] kvm-kmod: smp_send_reschedule compat mtosatti
2009-05-07 20:55 ` [patch 3/4] KVM: use smp_send_reschedule in kvm_vcpu_kick mtosatti
2009-05-08 7:13 ` Gleb Natapov
2009-05-07 20:55 ` [patch 4/4] KVM: protect assigned dev workqueue, int handler and irq acker mtosatti
2009-05-10 16:31 ` [patch 0/4] smp_send_reschedule / assigned dev host intx race v2 Avi Kivity
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=200904281508.47370.sheng@linux.intel.com \
--to=sheng@linux.intel.com \
--cc=kvm@vger.kernel.org \
--cc=mtosatti@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox