[ipxe-devel] unstable http downloads

Thomas Mieslinger miesi at pc-h.de
Mon Dec 2 13:42:37 UTC 2013

On 01.12.13 16:20, Gene Cumm wrote:
> What VMware product?  Why not try a newer version of PXELINUX?  Where
> did your pxelinux.0 binary come from?  Tried an ipxe.iso perhaps?

ESXi 5.5

Didn't try a newer pxelinux because it is the latest known to handle 
ProLiant DL360 G2, G3, G4, G5, G6 and G7 bioses the way we need it. As 
this is a guerrilla project to replace pxelinux with ipxe, I don't want 
to validate a newer pxelinux version.

>> The http Server is a centos 6.4 with apache httpd-2.2.15-29 serving files.
>> Downloads initiated by ipxe a very unstable. Often the vmlinuz or initrd.img
>> file downloads stuck at 43% or so.
>> The http servers tcp tuning values (tcp_wmem et al.) are centos stock
>> configuration.
>> How can I debug http downloading? Are there any recommendations like "use
>> cubic congestion control on server side"? Should I try to increase the
>> compiled in tcp receive buffer?
> As mentioned, a packet capture from a switchport mirror is best.
> Otherwise, from the HTTP server.

I'll try.


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