git: NFE - Change default RX ring size from 128 -> 256, Adjust moderation timer.

Chris Turner c.turner at 199technologies.org
Wed Sep 9 10:00:04 PDT 2009


Matthew Dillon wrote:
commit 5df3a6aa72f98f69fa498e2249e71d7a14a0f16f
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Wed Sep 9 09:10:58 2009 -0700
    NFE - Change default RX ring size from 128 -> 256, Adjust moderation timer.
    
    * NFE does not seem to be able to flow control the phy.  TCP reception
      using window scaling and large socket bufs can blow out the receiver ring
      before the interrupt has a chance to drain it.
    
      This results in the receiver dropping a packet and the transmitter
      seeing bursts of duplicate TCP acks and having to go into recovery.
    
does this interact with checksum offloading on the device?

have a few NFE's lying around .. would be good to know more if available!

Thanks,

- Chris





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