[syslinux] Very slow download with pxelinux > 4.07 on specific hardware

[Eric PEYREMORTE]

Le 26/02/2014 17:06, Eric PEYREMORTE a écrit :
> Hi,
>
> We only have Dell computers here. We have about 100 optiplex 380.
>
> Here is a link to download my wireshark traces :
> http://dl.free.fr/qgCPEM5Uo
>
> In this traces i tested pxelinux and lpxelinux 6.03 on optiplex 
> 740(the one working)
> and optiplex 380.
>
> pxelinux works on both computers but very slowly on 380 as seen in 
> traces.
>
> lpxelinux works only on 740. On 380 it seems to enter in a kind of 
> loop : the client computer sending Acknowledgement for a block 
> continuously (but not for every block)
>
> for lpxelinux on 380, it took 2 traces. One on the server, and one on 
> a hub i connected to the client. (note the problem happen even without 
> the hub and on all 380 computers)
>
> Cheers
>
> Le 26/02/2014 01:15, H. Peter Anvin a écrit :
>> On 02/25/2014 08:31 AM, Eric PEYREMORTE wrote:
>>> Notice the same thing happens with optiplex 790 (core i5 sandy bridge).
>>>
>>> With 790 too everything is ok with pxelinx 4.0.7.
>>>
>>> I'll post a wireshark later.
>> The common thread seems to be Dell...
>>
>>     -hpa
>>
>>
>>
>
>
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>
Ok i give up. I will stick with the old version version (4.07) which 
works well with dell 380 and 790.

I tried to understand what happened between 4.07 and 5 but i don't have 
the skill to understand low level c.

Seems that the memory management changed a lot, maybe the culprit. But 
as many other things changed this is not obvious...