[ipxe-devel] unstable http downloads

[Shao Miller]

Does tcpdump or Wireshark yield any clues as to what happens before and
while things get stuck?  - Shao

-----Original Message-----
From: ipxe-devel-bounces at lists.ipxe.org
[mailto:ipxe-devel-bounces at lists.ipxe.org] On Behalf Of Thomas Mieslinger
Sent: Friday, November 29, 2013 10:20
To: ipxe-devel at lists.ipxe.org
Subject: [ipxe-devel] unstable http downloads

Hi,

I have VMware VMs running on E5-2650 iron, 10g connected. The VM I want 
to install has an emulated e1000 chip which fist runs the stock vmware 
PXE ROM, then pxelinux 4.03 and then finally ipxe.lkrn.

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?

Thanks for your insight.

Thomas
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