netdev - [PATCH 0/3] ipv4 metrics super-sharing

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>] [day] [month] [year] [list]

Date:	Fri, 28 Jan 2011 14:35:00 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	netdev@...r.kernel.org
Subject: [PATCH 0/3] ipv4 metrics super-sharing

As I mentioned a few days ago, we can "super-share" the metrics
in the most common case, which is that there are not explicit
metrics set for a route.

This makes the metrics all zero, which means we can just alias
the pointer to dst_default_metrics.

Most importantly, this means we avoid atomics on the fib_info ref
count at dst destroy time.

Depending upon the configuration, this can also save a non-trivial
amount of memory in the routing tables.  Honestly, I doubt that
sites entertaining routing tables with hundreds of thousands of
routes have any non-zero metrics specified. :-)
--
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