[Xen-devel] Re: Even faster page copy for Xen?

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

It has to be said, possibly tmem excepted, there is very little page copying
in Xen.

 -- Keir

On 15/07/2010 19:15, "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx> wrote:

> Hi Jan, Keir --
> 
> My x86 assembly skills are much too poor to carefully evaluate
> and, if of value, implement this in Xen but given your previous
> interest, such as:
> 
> http://xenbits.xensource.com/xen-unstable.hg?rev/8de4b4e9a435
> 
> the following might be worth looking at.
> 
> Intel has just posted memcpy improvements for glibc for recent
> popular Intel processor families here:
> 
> http://article.gmane.org/gmane.comp.lib.glibc.alpha/15278
> 
> The preface to the above patch looks very enticing...
> 
> Semi-related, I wonder if you know, if there were a
> "copy_page_from_other_node()" to be used if the
> caller is fairly sure that the page is being copied
> between nodes, could this be made significantly faster
> than a normal copy_page()?
> 
> Thanks,
> Dan



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