kern/100519: Suboptimal network polling

Gleb Smirnoff glebius at
Fri Aug 11 13:40:39 UTC 2006

The following reply was made to PR kern/100519; it has been noted by GNATS.

From: Gleb Smirnoff <glebius at>
To: Arthur Hartwig <arthur.hartwig at>
Cc: freebsd-gnats-submit at
Subject: Re: kern/100519: Suboptimal network polling
Date: Fri, 11 Aug 2006 17:35:10 +0400

 On Wed, Jul 19, 2006 at 07:49:59AM +0000, Arthur Hartwig wrote:
 A> >Fix:
 A> Since the netisr is running when netisr_pollmore() is executing and swi_net() the main netisr despatcher loops until netisr is zero, it is sufficient in netisr_pollmore() to just set the bits in netisr and not also call legacy_setsoftnet():
 A> replace the two instances of:
 A>     schednetisrbits(1 << NETISR_POLL | 1 << NETISR_POLLMORE);
 A> in netisr_pollmore() by:
 A>     atomic_set_rel_int(&netisr, (1 << NETISR_POLL | 1 << NETISR_POLLMORE));
 Hmm, interesting. Have you done any profiling?
 Totus tuus, Glebius.

More information about the freebsd-bugs mailing list