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

[H. Peter Anvin]

On 05/08/2012 12:19 PM, Pasi Kärkkäinen wrote:
> On Tue, May 08, 2012 at 12:00:32PM -0700, H. Peter Anvin wrote:
>> On 05/08/2012 11:51 AM, Pasi Kärkkäinen wrote:
>>>
>>> And one more mail to my monologue.. 
>>>
>>> After the PXE boot in the VM is complete and I transfer the *same* file over http
>>> from *Linux*, I don't get (almost) any TCP retransmits! 
>>>
>>> So the big amount of TCP retransmits is only happening when pxelinux.0 is downloading over http..
>>>
>>
>> Yes, I've seen this on hardware too... the PXE stack receiver briefly
>> stops responding.  I don't know if it is a pxelinux bug, a lwIP bug, or
>> a firmware bug...
>>
> 
> Ok, good that I'm not the only one seeing those.
> Any tweaks I could/should try? 
> 

core/lwip/src/include/lwipopts.h

... is full of tweakables if you want to try.

	-hpa