From: Tianyang Chen <tianyangpenn@gmail.com>
To: xen-devel@lists.xen.org
Cc: dario.faggioli@citrix.com, xumengpanda@gmail.com,
Tianyang Chen <tianyangpenn@gmail.com>
Subject: [PATCH] sched_rt: Improved nested virtualization performance
Date: Wed, 18 Nov 2015 22:50:21 -0500 [thread overview]
Message-ID: <1447905022-5633-1-git-send-email-tianyangpenn@gmail.com> (raw)
In nested virtualization, choosing the smaller value for the
time slice between the MAX_SCHEDULE and the budget will cause
high host CPU usage.
Signed-off-by: Tianyang Chen <tianyangpenn@gmail.com>
---
xen/common/sched_rt.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/xen/common/sched_rt.c b/xen/common/sched_rt.c
index 4372486..9da3f35 100644
--- a/xen/common/sched_rt.c
+++ b/xen/common/sched_rt.c
@@ -889,7 +889,7 @@ rt_schedule(const struct scheduler *ops, s_time_t now, bool_t tasklet_work_sched
}
}
- ret.time = MIN(snext->budget, MAX_SCHEDULE); /* sched quantum */
+ ret.time = MAX_SCHEDULE; /*should be used in nested virtualization*/
ret.task = snext->vcpu;
/* TRACE */
--
1.7.9.5
next reply other threads:[~2015-11-19 3:50 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-19 3:50 Tianyang Chen [this message]
2015-11-19 3:59 ` [PATCH] sched_rt: Improved nested virtualization performance Meng Xu
[not found] <1447903458-4736-1-git-send-email-tianyangpenn@gmail.com>
[not found] ` <CAENZ-+=T-t-vxYVKb-OSc0rjkRSriHvrBx8DjeCb2GKu1hFs8w@mail.gmail.com>
2015-11-19 9:51 ` Dario Faggioli
2015-11-19 15:01 ` Meng Xu
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