Re: [XenPPC] making xen tools on dom0 can be slow

[Maria Butrico <butrico@xxxxxxxxxxxxx>]

Maria Butrico wrote:
> This was discussed yesterday and it was suggested that I should enter a bug
> for this.  Since then I have done a few experiments:
>
> By default dom0 has 64M.  Under these condition make tools takes 24 minutes
> on a js20.
>
> make[1]: Leaving directory `/home/j9/xen-ppc/tools'
>
> real    24m1.321s
> user    0m34.716s
> sys     0m23.272s
>
> I have found this is about the case on average.  This is with the xen
> source tree on nfs.  I dismiss this as a network related problem since I
> see no evidence of this.
>
> By changing xen to give 128M to each domain and therefore to dom0, the same
> make, also with source over nfs takes less than 2 minutes.
>
> make[1]: Leaving directory `/home/j9/xen-ppc/tools'
>
> real    1m15.445s
> user    0m32.800s
> sys     0m14.753s
>
> I will not enter this as a bug.  If anything the bug is that one might not
> specify the memory size for dom0.
>
> (On a related note, once we alter xen to give each domain 128M, xm create
> no longer works.  Jimi is debugging this.)
>
> Also I reported slowness for starting xend.  I am still working with this
> and will post to the list as soon as I have more data.  Simply giving more
> memory to dom0 does not fix the slow xend start problem.
>
> Maria Butrico    <internet or sametime: butrico@xxxxxxxxxx;     Notes:
> Maria Butrico/Watson/IBM>
>
>
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>   
Jimi and I have looked more carefully at the xend startup problem.  xend 
is very slow if the tools or any part of the environment variable PATH 
are in an nfs mounted directory.  Xend starts in reasonable time if the 
tools are local and no part of the PATH environment variable points a to 
a remote directory. 

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