From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <868c557b9825d7f054aa7e77fe90cd60@hamnavoe.com>
To: 9fans@9fans.net
From: Richard Miller <9fans@hamnavoe.com>
Date: Mon,  1 Oct 2012 20:20:18 +0100
In-Reply-To: <1c5584910a3ef640f8f4a6510a0e2aa4@kw.quanstro.net>
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Subject: Re: [9fans] usbether
Topicbox-Message-UUID: bc4dd36a-ead7-11e9-9d60-3106f5b1d025

> of course the 64bit question is, which queue is dropping packets.
> there are so many to choose from.

Looks my initial guess was wrong.  I added some readahead to the kernel
usb driver and that didn't help at all.  Then I reduced the device's
buffering ("burst factor"), and increased the intermediate buffering
between input and output processes in the generic part of the usb/ether
driver.  That seems to have done the trick: no more dropped packets.

That's with the raspberry pi built-in usb ether.  My asix-based ethernet
dongle doesn't work any better on an x86 host; but at least it doesn't
work any worse.  Geoff has pushed the new usb/ether code onto sources.
Anybody who is actually using usb/ether - could you try the new version
and let us know if we've broken yours?