Re: Testing interface removal speedup patches from Eric Dumazet.
From: Ben Greear <hidden>
Date: 2011-05-09 21:03:57
On 05/09/2011 01:24 PM, Alex Bligh wrote:
Ben, --On 9 May 2011 12:42:39 -0700 Ben Greear [off-list ref] wrote:quoted
I use HZ of 1000, btw. I killed udev, haldaemon..seemed to be just my stuff running. I don't see any 'ifup' running with these things dead... If you want to post your script, I can run it on my machine...See below - run (on ubuntu) by service udev stop unshare -n bash ./ifseq -n 500 The unshare seems sufficient to stop any remaining udev listeners getting wind of interface creation/deletion.
You were not adding the 'up' flag on creation...and my script was. I changed my script to not do up and it reports similar numbers to yours... Also, deleting with IPs added is likely to be a lot more work than deleting w/out, as your script does. Created 500 veth in 12.954143 seconds (0.025908286 per interface). Added IP addresses in 28.35679 seconds (0.05671358 per addr). Deleted 500 veth in 21.503877 seconds. (0.043007754 per interface) Created 100 veth in 1.06471 seconds (0.0106471 per interface). Added IP addresses in 2.006418 seconds (0.02006418 per addr). Deleted 100 veth in 2.983303 seconds. (0.02983303 per interface) From your script: [root@lec2010-ath9k-1 lanforge]# /mnt/b32/greearb/tmp/testifs.bash -n 500 Mon May 9 13:53:31 PDT 2011 creating 500 interfaces Mon May 9 13:53:44 PDT 2011 done real 0m12.756s user 0m0.732s sys 0m11.943s Mon May 9 13:53:44 PDT 2011 deleting 500 interfaces Mon May 9 13:54:02 PDT 2011 done real 0m18.071s user 0m1.002s sys 0m8.376s [root@lec2010-ath9k-1 lanforge]# /mnt/b32/greearb/tmp/testifs.bash -n 100 Mon May 9 13:54:33 PDT 2011 creating 100 interfaces Mon May 9 13:54:34 PDT 2011 done real 0m1.048s user 0m0.092s sys 0m0.943s Mon May 9 13:54:34 PDT 2011 deleting 100 interfaces Mon May 9 13:54:36 PDT 2011 done real 0m2.219s user 0m0.134s sys 0m0.794s Thanks, Ben -- Ben Greear [off-list ref] Candela Technologies Inc http://www.candelatech.com