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Date:	Fri, 8 Jun 2007 16:30:39 -0700
From:	Stephen Hemminger <>
To:	Philip Romanov <>
Subject: Re: SKY2 vs SK98LIN performance on 88E8053 MAC

On Fri, 8 Jun 2007 13:41:55 -0700 (PDT)
Philip Romanov <> wrote:

> Hello!
> We are observing severe IPv4 forwarding degradation 
> when switching from sk98lin to sky2 driver. Setup:
> plain kernel, 88E8053 Marvell Yukon2 MAC,
> sk98lin is @revision coming from FC6, SKY2
> driver from kernel, both drivers are in NAPI
> mode. 
> Benchmarks are done using bidirectional traffic 
> generated by IXIA, sending 256-byte packets. Observed 
> packet throughput is almost 30% higher with sklin98
> driver. 
> Ethernet flow control is turned off in SKY2 driver 
> (hard-coded as off, we know about this problem).  
> I also have oprofile records of the drivers in case 
> anybody is interested.
> Please share info if you know anything on SKY2
> performance bottlenecks.

I'm surprised? The vendor driver has bogus extra locking and other
crap. Please send profile data.  Flow control should work on sky2 (now).

Are you routing or doing real TCP transfers?

Stephen Hemminger <>
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