| 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
| ||
|
Message-ID: <20070220114535.GB27069@2ka.mipt.ru> Date: Tue, 20 Feb 2007 14:45:35 +0300 From: Evgeniy Polyakov <johnpol@....mipt.ru> To: Eric Dumazet <dada1@...mosbay.com> Cc: akepner@....com, linux@...izon.com, davem@...emloft.net, netdev@...r.kernel.org, bcrl@...ck.org Subject: Re: Extensible hashing and RCU On Tue, Feb 20, 2007 at 12:34:59PM +0100, Eric Dumazet (dada1@...mosbay.com) wrote: > > Getting into account that network stack with NAPI schedules several > > packets to be queued into socket and all that happens without any > > infuence from userspace, trie/tree wins again in that regard that > > majority of the tree will be in the cache already. > > Nope, you receive 100 packets for 100 different flows. Only the code may be in > cache (minus for the first packet), and the very top of the tree... > > Forget cache. Forget it. First packet populates half of the top of the tree/trie to get to the bottom - another one goes to completely different location, but it still need to go through some of the just populated entries - it is a tree/trie nature - probability of a hit decreases two times in each level (for binary tree, for trie is is very different) until first 'miss', but it is still non zero. But generally I afgree that talking about caches can only be valid when all other issues are resolved completely. So, we need a patch. -- Evgeniy Polyakov - 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
Powered by blists - more mailing lists