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
| ||
|
Date: Fri, 15 Aug 2008 16:13:24 +0200 From: Andi Kleen <andi@...stfloor.org> To: imipak@...oo.com Cc: netdev@...r.kernel.org, Daniel Ng <daniel_ng11@...os.com> Subject: Re: Multicast Routing Kernel option? Jonathan Day <imipak@...oo.com> writes: > They could, I guess, but context switches are expensive (think 20ms > from kernel to user, and same in reverse) 40ms for a system call? That would be really horrible if it really were that slow. Fortunately it's not. A Core2 (Merom) here can do a very simple system call roundtrip (getppid()) in ~570 cycles, that is at 2Ghz less than 300ns. You are roughly 5 orders of magnitude off. -Andi -- 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