[syslinux] pxelinux 4.10-pre17 HTTP performance (cptime)

Gene Cumm gene.cumm at gmail.com
Fri Dec 30 16:12:44 PST 2011

On Fri, Dec 30, 2011 at 07:26, Schlomo Schapiro <schlomo at schapiro.org> wrote:
> Hi,
> thanks for writing cptime, after manually adding it to the Makefile of a
> lwip git checkout it compiled fine (same about prdhcp) (only isohybrid
> complained about a missing uuid/uuid.h)...

Fix already submitted and pending.

> I have a 64bit VM with VMXNET3 and go there this result:

Guest OS hint shouldn't matter much.  The VMXNET3 may.

> [image: cptime.png]
> (can everybody see the picture?)

Attached but sufficient.

> The download of a 180MB large file (Parted Magic initrd) takes between 60
> and 72 seconds, which is about 2.6 to 2.3 MiB/s.
> Can this go any faster? Or is this the most that we can get out of a
> preboot environment?

Is this via HTTP or TFTP?  I'm betting the latter and you've got about
double the best performance I've seen.

> BTW, what is the meaning of the +0, +1, -1 lines? Maybe you add there some
> hint to make it self-explanatory.

It's due to the low precision of the timer that was available when I
first wrote it (55 ms per tick, iirc).  I should change it to not put
that out, depending on the number of ticks (ie, if it's over something
like 100 or 1000).


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