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Date: Fri, 30 May 1997 08:59:53 -0700 (PDT)
From: bigfoot@stomped.com
To: freebsd-gnats-submit@FreeBSD.ORG
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Subject: kern/3719: cached routes flushed too quickly on busy systems
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>Number:         3719
>Category:       kern
>Synopsis:       cached routes flushed too quickly on busy systems
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Fri May 30 09:00:02 PDT 1997
>Last-Modified:
>Originator:     Guy Gustavson
>Organization:
Reliant Net Services
>Release:        2.1.5
>Environment:
FreeBSD stomped.com 2.1.5-RELEASE FreeBSD 2.1.5-RELEASE #1: Wed May 28 19:02:54 CDT 1997     bigfoot@stomped.com:/usr/src/sys/compile/BFKERNEL  i386
>Description:
In module /usr/src/sys/netinet/in_rmx.c
The maxium numbered of cached routes to allow before lowering the
maxium alouded time to live on a route is hard coded at 128.
This is probably to low for a heavily loaded system.

>How-To-Repeat:
Run a busy web server... like 50,000-100,000 page views a day.
Sorry, but varied and heavy traffic is about the only way to get the
expire messages.
>Fix:
On line 175 of /usr/src/sys/netinet/in_rmx.c Is have made this change

/* int rtq_toomany = 128;               /* 128 cached routes is ``too many'' 
int rtq_toomany = 512;          /* 512 cached routes is ``too many'' according to me. GWG.*/

This is too high for a lightly loaded system with little memory, and the orginal is too low for a heavily loaded system. I suggest that the limit should probably be based on amount of real memory in the system, and
somehow tied to the number of unique domains talked to each hour.
>Audit-Trail:
>Unformatted: