From mboxrd@z Thu Jan  1 00:00:00 1970
From: erik quanstrom <quanstro@labs.coraid.com>
Date: Thu,  1 Sep 2011 12:40:50 -0400
To: cinap_lenrek@gmx.de, 9fans@9fans.net
Message-ID: <ae483e78a44ae2f5e6d9eec2faff5a2d@coraid.com>
In-Reply-To: <23dfb939a8c5cbff1a54ca7f1a1b1057@gmx.de>
References: <23dfb939a8c5cbff1a54ca7f1a1b1057@gmx.de>
MIME-Version: 1.0
Content-Type: text/plain; charset="US-ASCII"
Content-Transfer-Encoding: 7bit
Subject: Re: [9fans] usb ohci testing
Topicbox-Message-UUID: 17dbc3a0-ead7-11e9-9d60-3106f5b1d025

On Thu Sep  1 12:27:31 EDT 2011, cinap_lenrek@gmx.de wrote:
> will try as soon as possible.
>
> as far as i can see that patch limits the packet size for
> the transfers to 8K no?

since each frame is 1ms, it would take a 64Mbit line rate
to deliver 8k/frame.  since by definition we're talking about
usb1.1, i don't see how you could get >8k/frame.

actually, i'm not sure how we could get over 4k/frame since
32Mbit >> 12Mbit.

> any insights on why this has such an dramatic impact on
> performance?

paging in a virtual environment is teh suck without hardware assist.

- erik