netdev - [PATCH 0/5] NET Improve layering of structs dst_entry/rtable/rt6_info/dn

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 for Android: free password hash cracker in your pocket

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

Date:	Thu, 08 Feb 2007 22:32:10 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	David Miller <davem@...emloft.net>
CC:	netdev@...r.kernel.org
Subject: [PATCH 0/5] NET Improve layering of structs dst_entry/rtable/rt6_info/dn_route
 to get less dcache footprint

Hi David

Large routers/servers spend lot of CPU time in route cache lookups. This is 
because each item lookup uses two cache lines : the next pointer is at the 
begining of item, but keys are far away from this pointer.

Furthermore, the u unions declared in struct rtable, rt6_info and dn_route are 
imho quite ugly (forcing next pointer be at null offset)

This patch try to cleanup the layering and try to put the 'next' pointer near 
the fields used at lookup time (in ip_route_input() for example)

I prepared the following five patches :

[PATCH 1/5] : Introduce union in struct dst_entry, to prepare patches 2,3,4
[PATCH 2/5] : Convert ipv4 route to use the new dst_entry 'next' pointer
[PATCH 3/5] : Convert ipv6 route to use the new dst_entry 'next' pointer
[PATCH 4/5] : Convert decnet route to use the new dst_entry 'next' pointer
[PATCH 5/5] : Reorder fields of struct dst_entry

Thank you
Eric Dumazet
-
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