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

[Ernst Bachmann <e.bachmann@xxxxxxxx>]

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

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users