kern/90890: [vr] Problems with network: vr0: tx shutdown timeout

[C. Weber]

The following reply was made to PR kern/90890; it has been noted by GNATS.

From: "C. Weber" <cwf-ml at arcor.de>
To: bug-followup at FreeBSD.org, maciejb at widzew.net
Cc:  
Subject: Re: kern/90890: [vr] Problems with network: vr0: tx shutdown timeout
Date: Wed, 25 Oct 2006 19:06:05 +0200

 and another followup:
 
 further tests show:
 
 - the problem only occurs when we use half duplex (both 10 and
    100 Mbps), with 100/full it does not happen (I currently
    lack the hardware to construct a 10/full test case).
    Apparently the card/driver has trouble with high
    collision rates.
 - regardless if the problem occurs I see extremely high
    interrupt loads for the vr device - a single full-speed
    ftp transfer to the system produces ~ 12.000 interrupts
    per second, which is huge and smashes the machine against
    the 100% load border. Apparently the driver or the
    hardware sees a need to interrupt for every single incoming
    or outgoing packet (the ftp transfer has ~8000 pps incoming and
    ~4000 pps outgoing (acks).
 
 Regards, Christoph Weber-Fahr