| 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: <46F8007A.6000701@candelatech.com> Date: Mon, 24 Sep 2007 11:22:50 -0700 From: Ben Greear <greearb@...delatech.com> To: Rick Jones <rick.jones2@...com> CC: Steve Wise <swise@...ngridcomputing.com>, hadi@...erus.ca, Evgeniy Polyakov <johnpol@....mipt.ru>, netdev@...r.kernel.org, Robert Olsson <Robert.Olsson@...a.slu.se> Subject: Re: pktgen question Rick Jones wrote: >>> Perf-wise, you could clone the skbs up front, then deliver them to >>> the nic in a tight loop. This would mitigate the added overhead >>> introduced by calling skb_clone() in the loop doing transmits... >> >> That only works if you are sending a small number of skbs. You can't >> pre-clone several minutes worth of 10Gbe traffic >> with any normal amount of RAM. > > Does pktgen really need to allocate anything more than some smallish > fraction more than the depth of the driver's transmit queue? If you want to send sustained high rates of traffic, for more than just a trivial amount of time, then you either have to play the current trick with the skb_get(), or you have to allocate a real packet each time (maybe with skb_clone() or similar, but it's still more overhead than the skb_get which only bumps a reference count.) I see no other way, but if you can think of one, please let me know. Thanks, Ben -- Ben Greear <greearb@...delatech.com> Candela Technologies Inc http://www.candelatech.com - 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