lkml.org 
[lkml]   [2003]   [Feb]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Longstanding networking / SMP issue? (duplextest)
On Thu, 20 Feb 2003, Andi Kleen wrote:

> On Thu, Feb 20, 2003 at 01:20:43AM -0800, Simon Kirby wrote:
> > On Thu, Feb 20, 2003 at 08:52:46AM +0100, Andi Kleen wrote:
> >
> > > That's probably because of the lazy ICMP socket locking used for the
> > > ICMP socket. When an ICMP is already in process the next ICMP triggered
> > > from a softirq (e.g. ECHO-REQUEST) is dropped
> > > (see net/ipv4/icmp_xmit_lock_bh())
> >
> > Hmm...and this is considered desired behavior? It seems like an odd way
> > of handling packets intended to test latency and reliability. :)
>
> IP is best-effort. Dropping packets in odd cases to make locking simpler
> is not unreasonable. Would you prefer an slower kernel?

Software is not a zero sum exercise. Therefore "fast" and "correct" are
not mutually exclusive.

--
bill davidsen <davidsen@tmr.com>
CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.

-
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: 2005-03-22 13:33    [W:0.058 / U:0.644 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site