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Re: [SPAM] Re: [Xen-devel] [SPAM] About the differences between Version

To: Fang Yuming <fangyuming@xxxxxxxxxxxxxxxxxx>
Subject: Re: [SPAM] Re: [Xen-devel] [SPAM] About the differences between Version 3.3 and Version 3.0
From: Samuel Thibault <samuel.thibault@xxxxxxxxxxxxx>
Date: Thu, 28 Aug 2008 14:56:32 +0100
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Fang Yuming, le Thu 28 Aug 2008 21:49:29 +0800, a écrit :
> >> Do these codes include the algorithm processing disk requests from
> >> different domains?
> > 
> > No, Xen just lets linux do that, in block/*iosched.c
> Does this mean that I should modify the dom0(linux) kernel( in 
> block/*iosched.c) if I want to do some experiments 
> about the disk scheduling algorithm of virtual disk scheduling algorithm?

Since that's the component that does it, yes.

> >> 3. I found the newest Version is Version 3.3, can anyone tell me the 
> >> majors differences between 
> >> Version 3.3 and Version 3.0?
> > 
> > See the announces of 3.1, 3.2 and 3.3.
> > 
> >> And is there any change in the part of virtual disk, especially the
> >> scheduling alogithm of different disk requests from domains?
> > 
> > Again, that's just dom0's Linux matter.
> From your answers, I know that if I want to do some research on virtual disk 
> schedling algorithm, I should 
> modify the disk scheduling part of linux kernel and it is no need to change 
> other parts of Xen?

Indeed. You may want to make the block backend provide the domid to the
io scheduler for e.q. better fairness, however.


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