From: Heinrich Schuchardt xypron.debian@gmx.de To: Duncan Hare dh@synoia.com; Alexander Graf agraf@suse.de Subject: Re: [U-Boot] [PATCH 1/1] efi_loader: add a README.iscsi describing booting via iSCSI

On 01/25/2018 08:39 PM, Duncan Hare wrote:

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----- Forwarded Message -----   From: Alexander Graf agraf@suse.de   To: Heinrich Schuchardt xypron.glpk@gmx.de

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The appended README explains how U-Boot and iPXE can be used to boot a diskless system from an iSCSI SAN.

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We are implementing a limited TCP and a wget (http 1.0) app.>> It is almost ready for an test release. Selective Acknowledgment (SACK) is under test as a final piece of the TCP stack.

In which git can I find the code?

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We have noticed that omitting the http 1.0 declaration in downloading the kernel from an nginx web server that we remove the overhead of an http header completely.

RFC 1945 - Hypertext Transfer Protocol -- HTTP/1.0

You should not program to please another accommodating software but according to a standard.

I agree. The comment was a FYI.

The key to TCP performance is supporting multiple packets in flight.

And we do. That's set in include/net.h in the buffer definitions.With single packet-at-a time one might as well stick with udp. I've worked on network communication protocols since 1973.c programming, not so much. git, I'm a newb.

HeinrichIt is not yet pushed to git.I need to fix the bugs in SACK before taking that step. I had hoped this week but I was delayed by flu. It adheres to http 1.0. It is a minimal implementation. It is relatively fast. It drives a Raspberry Pi at 10 M bits/sec, the limitation being the raspberry pi processor speed.

I can send you a tarball, together with the changes to tftp.c for testing that a downloaded image is correct.

Regards Duncan Hare

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