netdev - Re: iproute2 proposal

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <489960B3.4050708@trash.net>
Date:	Wed, 06 Aug 2008 10:28:35 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Denys Fedoryshchenko <denys@...p.net.lb>
CC:	Stephen Hemminger <shemminger@...ux-foundation.org>,
	netdev@...r.kernel.org
Subject: Re: iproute2 proposal

Denys Fedoryshchenko wrote:
> While using iproute2 in batch mode i notice that adding 11362 rules, on system 
> with 500+ interfaces takes up to 1minute on Xeon 3.0 Ghz.
> After "oprofiling" i got result:
>
> CPU: P4 / Xeon with 2 hyper-threads, speed 2992.84 MHz (estimated)
> Counted GLOBAL_POWER_EVENTS events (time during which processor is not 
> stopped) with a unit mask of 0x01 (mandatory) count 100000
> samples  %        image name               symbol name
> 86166    57.3473  tc                       ll_remember_index
> 48103    32.0147  tc                       parse_rtattr
> 8497      5.6551  tc                       rtnl_dump_filter
> 1751      1.1654  [vdso] (tgid:22801 range:0xb7f66000-0xb7f67000) (no symbols)
> 1085      0.7221  tc                       tc_calc_xmittime
> 672       0.4472  tc                       .plt
>
> I did small patch, and voila! batch finished in 2 seconds successfully!
>
> Proof of concept patch is attached. Not sure if it is not breaking any other 
> things. Waiting for any comments.

It breaks batches that add links and then configure them. You need
to invalidate the link map on "ip link add/del" and "ip tunnel add/del".
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html