Re: [Etherboot-developers] [PATCH] make undionly robust against drivers that drop interrupts

[H. P. A. <hp...@zy...>]

On 11/26/2009 12:50 PM, Joshua Oreman wrote:
> On Thu, Nov 26, 2009 at 3:26 AM, Alex Zeffertt
> <ale...@eu...> wrote:
>> However, I've noticed that whilst undionly.kpxe is unable to cope with the
>> original e1000 driver, pxelinux.0 is able to cope.  Presumably, pxelinux.0 polls
>> continuously whereas undionly.kpxe only polls if an interrupt has been received.
> 
> PXE provides three network APIs: TFTP, UDP, and UNDI. Since PXELINUX
> only supports fetching files over TFTP, it uses the TFTP API, which is
> not interrupt-driven and so wouldn't be affected by this issue in
> e1000. It's only the UNDI API, which is used by programs (like a
> client gPXE) needing direct control over the raw bytes sent over the
> network interface, that requires some finesse with interrupts.
> 

PXELINUX uses the UDP API, not TFTP.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.