From: Andrew Cooper <andrew.cooper3@citrix.com>
To: zhangtrump <jamesfullstack@hotmail.com>,
"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
Subject: Re: Question about HLT VMExit reason
Date: Thu, 12 Feb 2015 10:06:49 +0000 [thread overview]
Message-ID: <54DC7B39.3000801@citrix.com> (raw)
In-Reply-To: <BAY167-W63A5CD7F9245DFD5BF24B2C2220@phx.gbl>
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On 12/02/15 09:24, zhangtrump wrote:
> Hi, all:
>
> I was testing networking performance from DomU to DomU running on
> different hosts. I used xentrace and xenalyze tools to get the trace
> info of receive side, and found that there was a time when vcpus
> (which handle the receive work) were in "Blocked" state.
> From the information of "VMExit" reason gotten by xenalyze tool,
> the "HLT" is the main exit reason. I am wondering when DomU will be
> exited because of "HLT"?
> Thanks.
Yes.
When one vcpu halts, Xen will schedule another vcpu in its place. There
is nothing to be gained at all by letting a pcpu stay halted in guest.
~Andrew
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next prev parent reply other threads:[~2015-02-12 10:06 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-12 9:24 Question about HLT VMExit reason zhangtrump
2015-02-12 10:06 ` Andrew Cooper [this message]
2015-02-12 10:24 ` Paul Durrant
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