netdev - Re: SKY2 vs SK98LIN performance on 88E8053 MAC

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Date:	Fri, 8 Jun 2007 18:20:02 -0700 (PDT)
From:	Philip Romanov <philip_romanov@...oo.com>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
Cc:	netdev@...r.kernel.org
Subject: Re: SKY2 vs SK98LIN performance on 88E8053 MAC

Hi, Stephen

We are doing pure IPv4 forwarding between two Ethernet
interfaces:

 IXIA port A<--->System Under Test<--->IXIA Port B

Traffic has two IP destinations for each direction and
L4 protocol is UDP. There are two static ARP entries
and only interface routes. Two tests are identical
except that we switch from one driver to another. 

Ethernet ports on the SUT are oversubscribed -- I'm
sending 60% of line rate (of 256-byte packets) and
measuring percentage of pass-through traffic which
makes to the IXIA port on the other side. Traffic is
bidirectional and system load is close to 100%.

I attach vmlinux and driver profiles I have taken with
oprofile 0.8.2. I can easily take more
measurements/experiemnts if need be. 

Regards,

   Philip


> > 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.
> >  
> 
> 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?
> 



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Download attachment "vmlinux-sk98lin-2.6.21.3-report" of type "application/octet-stream" (7381 bytes)

Download attachment "vmlinux-sky2-2.6.21.3-report" of type "application/octet-stream" (8510 bytes)

Download attachment "sk98lin-2.6.21.3-report" of type "application/octet-stream" (1927 bytes)

Download attachment "sky2-2.6.21.3.report" of type "application/octet-stream" (721 bytes)