[syslinux] Syslinux 4.04 gpxelinux.0 http performance problem with VMware VMs

Pasi Kärkkäinen pasik at iki.fi
Tue May 8 12:21:50 PDT 2012


On Mon, May 07, 2012 at 09:53:35PM -0400, Gene Cumm wrote:
> On Mon, May 7, 2012 at 4:40 PM, Pasi Kärkkäinen <pasik at iki.fi> wrote:
> > Hello,
> >
> > In my testing environment I have two VMs on ESXi 5.0.
> >
> > VM A = dhcp/tftp/PXE/http server, running CentOS 6.2. Syslinux 4.04 with the included gpxelinux.0.
> > VM B = PXE boot client.
> 
> > Any ideas what's causing the bad performance and those continuous retransmits?
> > Anything I should try to debug this?
> >
> > On baremetal with Intel NICs I've seen much better gpxelinux.0 download speeds over http.
> 
> Syslinux 4.04 is obsolete and probably not worth debugging.  4.05 is
> current and 4.10-pre20 is a beta with lwIP, a lightweight IP stack,
> eliminating the need for gPXE if you only want HTTP downloads.  I've
> already been testing 4.10-pre* in VMware VMs with success after my
> patch.  I've seen a solid 45-70 MB/s after that patch on VMware VMs.
> 

Hello again,

When using syslinux 4.10-pre20 pxelinux.0 I'm able to get 3-6 MB/sec 
over http with VMXNET3 NIC in the VM.

Did you have to do any special settings (or patches) to get to 45-70 MB/s ?

Thanks,

-- Pasi




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