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Enable net.isr.enable by default, causing "delivery to completion"

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(direct dispatch) in interrupt threads when the netisr in question
isn't already active.  If a netisr is already active, or direct
dispatch is already in progress, we queue the packet for later
delivery.  Previously, this option was disabled by default.  I have
measured 20%+ performance improvements in IP packet forwarding with
this enabled.

Please report any problems ASAP, especially relating to stack depth or
out-of-order packet processing.

Discussed with:	jlemon, peter
Sponsored by:	DARPA, Network Associates Laboratories
This commit is contained in:
Robert Watson 2003-10-01 21:31:09 +00:00
parent b79274ba41
commit 19288f738a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=120650
1 changed files with 1 additions and 1 deletions
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2
sys/net/netisr.c
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@ -108,7 +108,7 @@ static struct isrstat isrstat;
SYSCTL_NODE(_net, OID_AUTO, isr, CTLFLAG_RW, 0, "netisr counters");
static int netisr_enable = 0;
static int netisr_enable = 1;
SYSCTL_INT(_net_isr, OID_AUTO, enable, CTLFLAG_RW,
&netisr_enable, 0, "enable direct dispatch");