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From: | Avi Kivity |
Subject: | [Qemu-devel] Re: [kvm-devel] [PATCH 0/4] Rework alarm timer infrastrucure - take2 |
Date: | Sun, 19 Aug 2007 11:24:18 +0300 |
User-agent: | Thunderbird 2.0.0.0 (X11/20070419) |
Anthony Liguori wrote:
I think this is a really nice and important patch set. Just a couple things: On Sun, 2007-08-19 at 00:02 +0200, Luca Tettamanti wrote:In this case the dyn-tick minimum res will be 1msec. I believe it should work ok since this is the case without any dyn-tick.Actually minimum resolution depends on host HZ setting, but - yes - essentially you have the same behaviour of the "unix" timer, plus theoverhead of reprogramming the timer.Is this significant? At a high guest HZ, this is could be quite a lot of additional syscalls right?
At HZ=1000, this adds a small multiple of 1000 syscalls, which is a fairly small overhead. At HZ>1000 (only possible with a dyntick guest), the current implementation doesn't cope at all, so we can't compare overhead.
-- error compiling committee.c: too many arguments to function
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