Re: Stable tag slipped

[Raphael Marmier <raphael@xxxxxxxxxxx>]

Matthew Dillon wrote:
> :I've been running 3 loops of mirroring wget -m on the apache manual, 
> :with the fetched page deleted in between, MaxClients=256, 
> :MaxKeepAliveRequests=0. There is one loop runned localy.
> :
> :There are more than 4000 connections in TIME_WAIT, more than 4000 sockets.
> :
> :The server responds very well and there are no delays.
> :
> :Tomorrow I will try MaxKeepAliveRequests to an impossibly high number to 
> :generate long running connections and see how it copes.
> :
> :I welcome suggestions on what test to run as I am no expert in neither 
> :os nor networking.
> :
> :Raphael
>
>     Have you adjusted the portrange?  Do these:
>
> 	sysctl net.inet.ip.portrange
> 	sysctl net.inet.tcp.msl
> 	sysctl kern.ipc.maxsockets
> 	sysctl net.inet.tcp.recvspace
> 	sysctl net.inet.tcp.sendspace
>
>     You may also have to lower the MSL on the originating machines to reduce
>     the number of sockets being held in a TIME_WAIT state.
>
> 	(default is 30000ms)
> 	sysctl net.inet.tcp.msl=15000

currently with the same tests still running:

dragonfly# netstat -tn | wc -l
    3170
dragonfly# netstat -tn | fgrep TIME_WAIT | wc -l
    3105
dragonfly# netstat -m
197/551/18176 mbufs in use (current/peak/max):
        150 mbufs allocated to data
        47 mbufs allocated to packet headers
114/246/4544 mbuf clusters in use (current/peak/max)
629 Kbytes allocated to network (4% of mb_map in use)
0 requests for memory denied
0 requests for memory delayed
0 calls to protocol drain routines
dragonfly# uptime
 0:45  up  1:31, 2 users, load averages: 0,19 0,28 0,30
dragonfly# uptime
 0:45  up  1:31, 2 users, load averages: 0,18 0,27 0,30
dragonfly# sysctl net.inet.ip.portrange
net.inet.ip.portrange.lowfirst: 1023
net.inet.ip.portrange.lowlast: 600
net.inet.ip.portrange.first: 1024
net.inet.ip.portrange.last: 5000
net.inet.ip.portrange.hifirst: 49152
net.inet.ip.portrange.hilast: 65535
dragonfly# sysctl net.inet.tcp.msl
net.inet.tcp.msl: 30000
dragonfly# sysctl kern.ipc.maxsockets
kern.ipc.maxsockets: 8104
dragonfly# sysctl net.inet.tcp.recvspace
net.inet.tcp.recvspace: 57344
dragonfly# sysctl net.inet.tcp.sendspace
net.inet.tcp.sendspace: 32768
dragonfly#

The machine doing the hammering is a Mac running MacOSX.
[pomme:~] raphael% sysctl net.inet.tcp.msl
net.inet.tcp.msl: 600
[pomme:~] raphael% sysctl kern.ipc.maxsockets
kern.ipc.maxsockets: 512

Just keep in mind there is one loop running locally on the dfbsd machine 
being tested.

Why should the portrange be adjusted?

Raphael