lkml.org 
[lkml]   [2007]   [Feb]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
Subjectsky2 stable in 2.6.12-rc1 (but still performance problem)...
Hi Stephen,

2.6.21-rc1 is the first kernel where my SysKonnect Yukon 2 hardware
with the sky2 v1.13 driver is stable under moderate load. Before a few
GBs of data going over my GigE network quickly with NFSv4 would cause
transmit timeouts previously, but now fine.

I am still observing a performance problem - feels like a wmb() or
some buffer flushing is missing somewhere - disabling processor clock
scaling reduces the problem a bit, but does not eliminate it.

What are your preferred way of checking performance? I think that the
TCP send window can grow enough even if ACKs are delayed due to this
problem, such that TCP does not immediately demonstrate this issue. I
could restrict the window scaling factor, so it would be bound by the
data->ACK round-trip latency, which /should/ be low, but I've been
observing it higher. Maybe I try this.

I'll see what I get with iperf UDP also, since this shows min, max,
avg UDP packet latency IIRC.

Thanks for your great work so far though!
Dan
--
Daniel J Blueman
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-02-27 12:35    [W:0.067 / U:0.208 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site