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From: Yuehai Xu <yuehaixu@gmail.com>
To: George Dunlap <George.Dunlap@eu.citrix.com>
Cc: xen-devel@lists.xensource.com, yhxu@wayne.edu
Subject: Re: Question about the ability of credit scheduler to handle I/O and CPU intensive VMs
Date: Thu, 7 Oct 2010 20:25:12 -0400	[thread overview]
Message-ID: <AANLkTinG-y8gOW1jVpvKgJU2fBiiDkgj5r=FAOv=0J8q@mail.gmail.com> (raw)
In-Reply-To: <AANLkTik+tZTr8RQrbCwTFYZjbgW6tDq=LTcoBC2xsQhw@mail.gmail.com>

> I originally considered that when a Dom has an I/O event, its VCPU
> would be waken up, in another word, csched_vcpu_wake(struct vcpu *vc)
> should be invoked. However, I find I am definitely wrong. As long as
> there is a CPU intensive program running in a Dom, this Dom should
> never be in a state of "sleep"? In another word, it should never be
> waken up?
>

The trace result from xenalyze confirms that when a VM has a running
CPU intensive program, it never needs to be waken up. So, my question
is, how can I schedule a VM that has I/O event immediately even this
VM is CPU intensive? I think it is impossible to implement it in the
function csched_vcpu_wake.

Also, is it possible to trace the I/O procedure by xenalyze? I notice
even the macro TRC_HVM_IO_READ is defined, I don't find it is used in
anywhere.

Thanks,
Yuehai

  reply	other threads:[~2010-10-08  0:25 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-09-13 21:37 Question about the ability of credit scheduler to handle I/O and CPU intensive VMs Yuehai Xu
2010-09-13 23:29 ` Jeremy Fitzhardinge
2010-09-14  1:38   ` Yuehai Xu
     [not found] ` <AANLkTin9E1m_jFcj4Ak7nB9OxcQynrznpQ_nNPi_U7hN@mail.gmail.com>
2010-09-14 14:58   ` Yuehai Xu
2010-09-30 12:28   ` Yuehai Xu
2010-09-30 13:27     ` George Dunlap
2010-10-05  2:52       ` Yuehai Xu
2010-10-05 14:16         ` George Dunlap
2010-10-05 14:56           ` Yuehai Xu
2010-10-05 15:02             ` George Dunlap
2010-10-07 22:18               ` Yuehai Xu
2010-10-08  0:25                 ` Yuehai Xu [this message]
2010-10-08  9:57                   ` George Dunlap
2010-10-08 10:03                     ` George Dunlap
2010-10-08 10:11                       ` George Dunlap
2010-10-10  4:08                     ` Yuehai Xu
2010-10-10  8:30                       ` cendhu
2010-10-11 11:05                       ` George Dunlap
2010-10-12 12:42                         ` Yuehai Xu
2010-10-18 10:25                           ` George Dunlap
2010-10-05  4:30       ` question about lineat pagetable and mfn_x strongerwill

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