From: Poul-Henning Kamp <phk@critter.freebsd.dk>
Date: Fri, 04 Jun 1999 21:27:57 +0200
Subject: Проблемы с keepalive соединениями под FreeBSD
In message <[20]199906041824.LAA29444@implode.root.com>, David Greenman writes:
>>>But, consider going back to the discusssions leading up to the Host Requirem ents
>>>RFC (1122). The particular problem was that the original timeout value for
>>>keepalives was tiny (a few minutes). 1122 dictated the corrections for this.
>>>Here are the important points from section 4.2.3.6:
>>
>>But RFC 1122 pretty much entirely predates the "modern internet user". While
>>I fully supported the policy back then, I no longer do.
>>
>>I still think the right thing is:
>>
>> default to keepalives.
>> set the timeout to a week.
>
> I don't support increasing the default timeout. That would cause problems
>for a lot of server systems that rely on the relatively short two hour default.
>The best I think you could do would be to increase it to something like
>12-24 hours as a default, but even that might be problematical.
> Actually, I think we should leave it alone. I don't mind if people add an
>rc.conf variable, however.
First of all, our current default is not two hours, but to kill
after 4 hours idle followed by no response for 20min:
So anyone depending on two hours are screwed already.
How about this then:
net.inet.tcp.always_keepidle: 86400 /* new variable */
net.inet.tcp.always_keepintvl: 64800 /* new variable */
net.inet.tcp.keepidle: 14400
net.inet.tcp.keepintvl: 150
net.inet.tcp.always_keepalive: 1
This will have all sockets have keepalives, but if the program
specifically sets keepalives, it gets the shorter timeout.
--
Poul-Henning Kamp FreeBSD coreteam member
phk@FreeBSD.ORG "Real hackers run -current on their laptop."
FreeBSD -- It will take a long time before progress goes too far!
+ if [ "X$tcp_keepalive" = X"YES" ]; then
+ echo -n ' TCP keepalive=YES'
+ sysctl -w net.inet.tcp.always_keepalive=1 >/dev/null 2>&1
+ fi
+
if [ "X$ipxgateway_enable" = X"YES" ]; then
echo -n ' IPX gateway=YES'
sysctl -w net.ipx.ipx.ipxforwarding=1 >/dev/null 2>&1
Index: defaults/rc.conf
RCS file: /home/ncvs/src/etc/defaults/rc.conf,v
retrieving revision 1.9
diff -u -r1.9 rc.conf
--- rc.conf 1999/05/16 09:19:44 1.9
+++ rc.conf 1999/06/05 05:26:26
@@ -41,6 +41,7 @@
natd_flags="" # Additional flags for natd.
tcp_extensions="NO" # Set to Yes to turn on RFC1323 extensions.
log_in_vain="NO" # Disallow bad connection logging (or YES).
+tcp_keepalive="YES" # Kill dead TCP connections (or NO).
network_interfaces="lo0" # List of network interfaces (lo0 is loopback).
ifconfig_lo0="inet 127.0.0.1" # default loopback device configuration.
#ifconfig_lo0_alias0="inet 127.0.0.254 netmask 0xffffffff" # Sample alias entr
y.
--
Poul-Henning Kamp FreeBSD coreteam member
phk@FreeBSD.ORG "Real hackers run -current on their laptop."
FreeBSD -- It will take a long time before progress goes too far!
645 Прочтений • [Проблемы с keepalive соединениями под FreeBSD (freebsd trouble optimization tune speed sysctl kernel)] [08.05.2012] [Комментариев: 0]
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