Re: [Xen-users] Is my xen-friendly glibc really faster?

["Chris Fanning" <christopher.fanning@xxxxxxxxx>]

Hi Ernst,

> If you run them in a domU, my guess would be the slowdown is caused by your
> VNC/NX/remote X11 connection, not from the processing in domU.

I had exported nfs:/home from another domU. When I moved the home
export to dom0 performance improved a lot.
Perhaps this is because of some disk access bottleneck cause buy KDE
Dcop or IPC or Unix sockets or something when running the home is on
another domU.

What do you think?

Chris.

On 2/21/06, Ernst Bachmann <e.bachmann@xxxxxxxx> wrote:
> On Tuesday 21 February 2006 23:03, Chris Fanning wrote:
>
> > After compiling xen on a debian testing
> > mv /lib/tls /lib/tls.disabled
>
> If that mv makes your system faster or slower depends entirely on your
> application. After all, this disables the NPTL thread libraries, which are
> said to give a huge performance boost (>100% in some syntetic benchmarks) to
> threaded apps.
>
> > and in a domU I installed kde, openoffice, mozilla, etc.
> > Performance is not what I expected so I compiled a xen-friendly libc6
>
> If you run them in a domU, my guess would be the slowdown is caused by your
> VNC/NX/remote X11 connection, not from the processing in domU.
>
> >
> > -----I copied this from the xen-users list------
> > Debian's current glibc-2.3.5-6 seems to have included this patch already.
> > apt-get build-dep libc6
> > apt-get source libc6
> >
> > edit debian/rules adding
> > '-mno-tls-direct-seg-refs' to BUILD_CFLAGS y HOST_CFLAGS.
> >
> > dpkg-buildpackage -rfakeroot
> > -------thanks-----------
> > after installing libc6_2.3.5-13_i386.deb I don't get that warning anymore
> > :)
> >
> > but performance hasn't noticeably improved.
>
> Well, thats the prefered solution, you get the speedups from NPTL without the
> slowdown incurred by xen's emulation of TLS memory access.
>
> > How can I test this?
>
> run some benchmarks?
>
> /Ernst
>
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