Re: [SPAM] Re: [SPAM] About the differences between Version 3.3 and Version 3.0

[Samuel Thibault <samuel.thibault@eu.citrix.com>]

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.

Samuel