Linux kernel tuning TCP/Memcached

[jc-8FIgwK2HfyJMuWfdjsoA/w at public.gmane.org]

Matthew Gillen wrote:
| http://www.speedguide.net/read_articles.php?id=121
| --------------------------------------
| TCP_TW_RECYCLE
| It enables fast recycling of TIME_WAIT sockets. The default value is 0
| (disabled). The sysctl documentation incorrectly states the default as
| enabled. It can be changed to 1 (enabled) in many cases. Known to cause some
| issues with hoststated (load balancing and fail over) if enabled, should be
| used with caution.
|
|     echo 1 > /proc/sys/net/ipv4/tcp_tw_recycle
|     (boolean, default: 0)
| --------------------------------------

Hmmm ... I'm trying to explain this:

: cat /proc/sys/net/ipv4/tcp_tw_recycle
0
: echo 1 > /proc/sys/net/ipv4/tcp_tw_recycle
-bash: /proc/sys/net/ipv4/tcp_tw_recycle: Permission denied
: sudo echo 1 > /proc/sys/net/ipv4/tcp_tw_recycle
-bash: /proc/sys/net/ipv4/tcp_tw_recycle: Permission denied
: cat /proc/sys/net/ipv4/tcp_tw_recycle
1
:

So it seems to have done it, despite the second error message. So I did a bit
of  testing, and verified that apache still works the same as before.  Now to
figure out whether I can stress test in on a "home"  ISP  connection  with  a
not-very-fast upload speed.


--
   _'
   O
 <:#/>  John Chambers
   +   <jc-8FIgwK2HfyJMuWfdjsoA/w at public.gmane.org>
  /#\  <jc1742-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org>
  | |