netdev - SKY2 vs SK98LIN performance on 88E8053 MAC

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Message-ID: <884143.12109.qm@web52311.mail.re2.yahoo.com>
Date:	Fri, 8 Jun 2007 13:41:55 -0700 (PDT)
From:	Philip Romanov <philip_romanov@...oo.com>
To:	netdev@...r.kernel.org
Subject: SKY2 vs SK98LIN performance on 88E8053 MAC

Hello!

We are observing severe IPv4 forwarding degradation 
when switching from sk98lin to sky2 driver. Setup:
plain 2.6.21.3 kernel, 88E8053 Marvell Yukon2 MAC,
sk98lin is @revision 8.41.2.3 coming from FC6, SKY2
driver from 2.6.21.3 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.

 Thanks in advance,

    Philip R.

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