Re: Only one concurrent connection in jail possible (5.4)

On Tuesday 28 February 2006 10:05, Phil Regnauld wrote:
service_ist@xxxxxxxxxxx (service_ist) writes:
Hi,

I've setup a server with 16 jails using 5.4. Right after bringing it
up I wondered about its bad performance.

We need to know many things here:

- CPU, RAM, disk, disk layout, swap

CPU: AMD Sempron 3000+
RAM: real memory = 1007 MB, avail memory = 977 MB
disk: 3ware 7006-2 with two Maxtor 6L160P0 in a raid 1
disk layout:
/dev/twed0s1a 496M 71M 386M 15% /
/dev/twed0s3d 119G 16G 94G 14% /home
/dev/twed0s1g 4.8G 28K 4.5G 0% /tmp
/dev/twed0s1d 4.8G 1.2G 3.3G 27% /usr
/dev/twed0s1f 5.3G 328M 4.6G 7% /usr/ports
/dev/twed0s1e 989M 400M 510M 44% /usr/src
/dev/twed0s2d 3.9G 48M 3.5G 1% /var
/dev/twed0s2e 3.9G 662M 2.9G 18% /var/ccache
/dev/twed0s2f 989M 5.5M 905M 1% /var/log
/dev/twed0s2g 1.9G 16M 1.8G 1% /var/tmp

The jails are in /home.

swap: 2 GB at twed0s1b

What does disk I/O look like ? (gstat)

Just zeros, with a little flickering some times.

What does network I/O look like ? (netstat -ain 1)

input (Total) output
packets errs bytes packets errs bytes colls
2 0 128 2 0 296 0
1 0 66 1 0 178 0
1 0 66 1 0 178 0
1 0 66 1 0 178 0
3 0 235 2 0 297 0
2 0 126 2 0 220 0
2 0 164 3 0 374 0
3 0 204 2 0 248 0
5 0 404 3 0 416 0
1 0 66 1 0 178 0
172 0 55221 181 0 51887 0
702 0 189462 696 0 193378 0
858 0 321384 862 0 324292 0
1091 0 193559 1099 0 194596 0
917 0 212652 911 0 213837 0
734 0 240609 717 0 241236 0
6 0 444 5 0 450 0
2 0 126 1 0 178 0
1 0 66 1 0 178 0
1 0 66 1 0 178 0

The part in the middle is when I'm doing a proxy request.

Interrupts ? (vmstat -i)

interrupt total rate
irq8: rtc 40520502 128
irq13: npx0 1 0
irq17: twe0 11152149 35
irq23: vr0 1217326 3
irq0: clk 31654941 99
Total 84544919 267


Have you read tuning(7) ? There's a lot of info in there about
socket tuning, network buffers, etc...

I've increased net.inet.ip.portrange to 15000 and kern.ipc.somaxconn to
512, what did not bring any results.

Check out what the logs say, eventual warnings on the console, etc...

No errors, no warnings.

Peter
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