crossbow discuss - Mar 2010 - [osol-code] GLDv3 NIC driver Performance on sparc

On 03/10/10 10:48 AM, Mahesh wrote:
> Hi all,
>
>   I need some help in debugging the gldv3 driver performance issue on
sparc. The driver has single Tx queue and 4 Rx queues and performs at almost the
line rate(10G) on Sun intel boxes but the same driver performs very badly on
sparc. The code is identical for sparc and intel except swapping involved since
the hardware is little endian . Any idea how to debug this issue ??
> The machine i tried to bench mark is T5440  and i have tried setting
ip_soft_rings_count = 16 on T5440 but result is same .
>    
  You might want to run lockstat(1M)
  to see if the driver routines are implicated as a problem.

  If the driver is not a problem, then you might want to try
  CPU binding with
     dladm set-linkprop -p cpus=0,1,...,24 <link>
  There may be other things to try here.

  Also, which OpenSolaris build are you running? In general,
  running the latest build is recommended for performance work.

Regards,
-Krishna

p.s. crossbow-discuss and/or network-discuss is more appropriate
  for these questions.