On 06/29/2017 12:52 PM, Marc Richter wrote:
Hi again,
I have checked this again today.
Send & receive buffers are both 1MB, the Server has 8 CPUs and during
startup BIND is reporting this:
found 8 CPUs, using 8 worker threads
using 7 UDP listeners per interface
using up to 32768 sockets
We only have about 1.500 queries per second on this server. CPU(30%) and
memory(50%) usage also is not an issue here.
Do you have any adjustments in /etc/system ?
I will assume you don't have ip_forwarding messed with and let's just
look at your network stack config. You don't need to publish your
results to the maillist but have a look at :
# ndd -get /dev/ip \? | grep "read"
# ndd -get /dev/tcp \? | grep "read"
Here you have the full range of stack kernel tunables. At the very least
the ones you can read data from.
You probably already did this but create a quick script :
#!/bin/sh
/usr/bin/printf "\n"
/usr/bin/printf "tcp_wscale_always = "
ndd -get /dev/tcp tcp_wscale_always
/usr/bin/printf "tcp_tstamp_if_wscale = "
ndd -get /dev/tcp tcp_tstamp_if_wscale
/usr/bin/printf "tcp_max_buf = "
ndd -get /dev/tcp tcp_max_buf
/usr/bin/printf "tcp_cwnd_max = "
ndd -get /dev/tcp tcp_cwnd_max
/usr/bin/printf "tcp_xmit_hiwat = "
ndd -get /dev/tcp tcp_xmit_hiwat
/usr/bin/printf "tcp_recv_hiwat = "
ndd -get /dev/tcp tcp_recv_hiwat
Run that.
What I see here on three diff Sol10 servers for various purposes is :
M5 # /tmp/foo.sh
tcp_wscale_always = 1
tcp_tstamp_if_wscale = 1
tcp_max_buf = 1048576
tcp_cwnd_max = 1048576
tcp_xmit_hiwat = 49152
tcp_recv_hiwat = 49152
st0 # /tmp/foo.sh
tcp_wscale_always = 1
tcp_tstamp_if_wscale = 1
tcp_max_buf = 1048576
tcp_cwnd_max = 1048576
tcp_xmit_hiwat = 49152
tcp_recv_hiwat = 49152
st1 #
tcp_wscale_always = 1
tcp_tstamp_if_wscale = 1
tcp_max_buf = 16777216
tcp_cwnd_max = 8388608
tcp_xmit_hiwat = 65535
tcp_recv_hiwat = 65535
The first two are defaults whereas the last unit needs to sling around
terabytes daily. I am curious what your system thinks it is doing
with its tcp/ip stack.
Since you are on contract ( me too .. arn't we all these days ) then I
have to assume you have reasonable kernel updates and tcp patches in
this Solaris server ?
Dennis
_______________________________________________
Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe
from this list
bind-users mailing list
bind-users@lists.isc.org
https://lists.isc.org/mailman/listinfo/bind-users
