I have OpenDKIM properly set up to sign emails from my domain such that when sent through Amazon SES, Yahoo Mail shows dkim=pass. Given I got the infrastructure working, is there any benefit to having Amazon's DKIM signature instead of my own, say for spam filtering purposes?
I have a desktop running Ubuntu Quantal using OpenStack Folsom on an Intel i5 with 32 GB RAM and 2 GB swap. I'm running 7 VMs each sized like a EC2 m1.small, so 1.7 GB RAM each. I'm using KVM.
As I get up to running 5 or 6 concurrently, the host starts to swap them out:
top - 23:45:42 up 3 days, 1:51, 10 users, load average: 0.37, 0.75, 1.15
Tasks: 418 total, 2 running, 413 sleeping, 3 stopped, 0 zombie
%Cpu(s): 8.8 us, 2.1 sy, 0.0 ni, 88.8 id, 0.0 wa, 0.0 hi, 0.3 si, 0.0 st
KiB Mem: 32864580 total, 32586956 used, 277624 free, 574236 buffers
KiB Swap: 1998844 total, 1113352 used, 885492 free, 16498252 cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
24652 libvirt- 20 0 4169m 1.7g 7756 S 3.6 5.4 4:49.37 kvm
25233 libvirt- 20 0 4450m 1.6g 7756 S 1.2 5.2 4:35.12 kvm
25589 libvirt- 20 0 4163m 1.6g 7756 S 2.4 5.1 4:40.31 kvm
6562 root 39 19 2935m 658m 7460 S 0.0 2.1 100:05.62 java
28393 libvirt- 20 0 4149m 624m 7756 S 0.0 1.9 2:25.01 kvm
28106 libvirt- 20 0 4170m 617m 7756 S 0.0 1.9 2:18.17 kvm
26519 libvirt- 20 0 4167m 590m 7756 S 0.0 1.8 2:22.16 kvm
29399 libvirt- 20 0 4159m 589m 7756 S 0.0 1.8 2:19.94 kvm
$ free -m
total used free shared buffers cached
Mem: 32094 31868 225 0 559 16175
-/+ buffers/cache: 15134 16959
Swap: 1951 1087 864
# /tmp/swap-used.sh |grep kvm
PID=944 - Swap used: 0 - (kvm-irqfd-clean )
PID=24652 - Swap used: 102468 - (kvm )
PID=25233 - Swap used: 108644 - (kvm )
PID=25589 - Swap used: 155768 - (kvm )
PID=26519 - Swap used: 192216 - (kvm )
PID=28106 - Swap used: 150796 - (kvm )
PID=28393 - Swap used: 208488 - (kvm )
PID=29399 - Swap used: 187388 - (kvm )
I've already tried setting swapiness to 20, then 10 and finally to 0, none of which has made a difference:
# cat /proc/sys/vm/swappiness
0
I haven't rebooted the host since changing it from 60 to 0 (do I need to reboot)? I've also turned off swap completely with /sbin/swapoff -a; /bin/swapon -a. Immediately after re-enabling swap, I see this:
$ vmstat 5
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
2 0 11384 247572 652736 16539748 11 10 291 228 13 12 7 3 87 3
0 0 12968 234360 652756 16554432 0 317 8576 1240 3508 5470 17 2 75 5
1 0 17068 243512 652768 16559508 0 820 9448 1216 3687 4845 20 2 77 2
1 0 20040 233300 652772 16576152 0 594 12262 677 4436 5063 29 2 68 1
1 0 22764 219156 652792 16594448 6 546 11962 727 3870 4559 28 1 68 2
3 0 40832 229384 652776 16602440 0 3614 58404 4176 2051 6231 21 2 66 10
1 0 52420 232236 652784 16613320 0 2318 42174 2512 1819 4026 15 2 77 6
I've got 15 GB of free memory that can be used without having the processes swapped out.