[ipxe-devel] unstable http downloads

Thomas Mieslinger miesi at pc-h.de
Mon Dec 2 13:44:46 UTC 2013

Replying to myself to inform you that when I load undionly.kpxe 
(directly from the emulated e1000 pxe stack) then I have stable 
downloads. So there could something with e1000 driver.

On 29.11.13 16:20, Thomas Mieslinger wrote:
> 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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