netdev - Re: sky2 silicon bugs and workarounds...

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Date:	Mon, 2 Jul 2007 08:56:12 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	"Daniel J Blueman" <daniel.blueman@...il.com>
Cc:	"Linux Netdev" <netdev@...r.kernel.org>
Subject: Re: sky2 silicon bugs and workarounds...

On Mon, 2 Jul 2007 14:37:06 +0100
"Daniel J Blueman" <daniel.blueman@...il.com> wrote:

> Hi Stephen,
> 
> When the sky2 driver initialises, it sets the the ISR timer register
> (STAT_ISR_TIMER_INI) to 125 * 20 = 2500, whereas the vendor sk98lin
> driver sets it to 400, irrespective of the clockspeed of the NIC
> processor.
> 
> I guess you found more performance/stability from this value...?


Not really, it was just a rough guess to try and get more frames
per irq under DoS load.  Haven't fine tuned those values.

> 
> I've checked through the errata workarounds common to my rev-1 and 2
> Yukon-EC chips...the HWF_WA_DEV_4167 "oversize receive hang"
> workaround checks and can reset the (as I understand) bus master unit
> of the NIC (in CheckRxPath) in a periodic timer that is fired, where
> is finds no progress is made.

Where did you get those errata's. I keep having to do reverse
engineering guessing with vendor driver.

> With the issues we see, can they be detected earlier by the stats
> counters not being incremented, then resetting the bus-master unit,
> rather than the whole chip getting kicked after a far longer period.
> 
> It looks like if it is a silicon bug, we can just acknowledge it and
> have a better framework to detect the chip's PCI interface locking up
> and kick it in a smarter way perhaps...
> 
> Daniel
> --
> Daniel J Blueman


-- 
Stephen Hemminger <shemminger@...ux-foundation.org>
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