From: "Cliff Scott" <virtualized_ecs_users@2rosenthals.com>
Message-Id: <200912101420.nBAEKlro006790@smtp9.trip.net>
Date: Thu, 10 Dec 2009 08:20:46 -0600
To: "Virtualized eCS Users Mailing List" <virtualized_ecs_users@2rosenthals.com>
Reply-To: "Cliff Scott" <cliff185@intergate.com>
In-Reply-To: <list-1984278@2rosenthals.com>
References: <list-1984278@2rosenthals.com>
Subject: Re: [Virtualized eCS] TAP driver killing TCP/IP bandwidth
MIME-Version: 1.0

** Reply to message from "Lewis G Rosenthal"
<virtualized_ecs_users@2rosenthals.com> on Thu, 10 Dec 2009 01:22:03 -0500

> Hi, Cliff...
> 
> On 12/09/09 10:43 pm, Cliff Scott thus wrote :
> > ** Reply to message from "Lewis G Rosenthal"
> > <virtualized_ecs_users@2rosenthals.com> on Wed, 09 Dec 2009 14:01:33 -0500
> >
> >   
> >> Has anyone else seen this type of performance hit caused by the TAP driver?
> >>     
> >
> > I don't know if this qualifies as a performance hit, but with the TAP driver
> > my entire external network goes dead. I've spent many hours trying all kinds
> > of stuff and finally gave up. I also have a Broadcom B57 nic, but am using
> > the native driver.
> >
> >   
> That sounds like it might be related, considering the falloff in 
> bandwidth I saw with the native driver vs GenMAC. If you feel like 
> giving it a whirl, see if the GenMAC driver at least gets you out to the 
> net. As I said before, I wasn't even aware of just how bogged my 
> performance was until I tested it. Most of my LAN file transfers go over 
> IPX, which has *always* outperformed TCP for me (when writing to NetWare 
> volumes, at least; I really don't do much FTP-over-LAN, and no peer 
> transfers at all).
> 
> Cheers/2, and thanks for following up, Cliff.

Lewis,

I've tried the use Genmac in the past and it doesn't recognize my card. I
submitted the details from PCI sniff and as of the last time I tried it still
wouldn't recognize it. Maybe I should try again since it's been a while since
I tried.

-- 

Cliff
eCS 2.0RC7