Getting two distinctive behaviors from two RHEL 5 servers. Seems the host with
the 82599 NICs reports significant latency when read requests surpass 32KB. The
host with the 82598 NICs does not demonstrate this behavior. It's our
understanding that the two NIC adapters perform different offload capability.
The 82599-based adapters support HW based receive side coalescing (RSC) which
can merge multiple frames from the same IPv4 TCP/IP flow into a single
structure that can span one or more descriptors, while the 82598-based adapter
rely on driver side LRO for aggregation.
DCB is enabled on the arrays ports and don't know if this has any relevance to
the above issue.
------------------------------------------------------------------------------
Everyone hates slow websites. So do we.
Make your web apps faster with AppDynamics
Download AppDynamics Lite for free today:
http://p.sf.net/sfu/appdyn_d2d_nov
_______________________________________________
E1000-devel mailing list
E1000-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/e1000-devel
To learn more about Intel® Ethernet, visit
http://communities.intel.com/community/wired
