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, 25 May 2012 19:18:15 +0200 From: Eric Dumazet <eric.dumazet@...il.com> To: Tom Herbert <therbert@...gle.com> Cc: Denys Fedoryshchenko <denys@...p.net.lb>, netdev@...r.kernel.org Subject: Re: Strange latency spikes/TX network stalls on Sun Fire X4150(x86) and e1000e On Fri, 2012-05-25 at 09:59 -0700, Tom Herbert wrote: > > TX completion has no budget, I am not sure what you mean. > > > Right, it's the budget on RX that can be a factor. TX completion is > done from the NAPI poll routine, so if RX does not complete the NAPI > is rescheduled and TX completion is done again for the same HW > interrupt. > > We need to remove the constraint that netdev_completed can only be > called once per interrupt... Not clear where is this constraint in the code. Under heavy load, we can be in a loop situation, one cpu serving NAPI for a bunch of devices (no more hardware interrupts are delivered since we dont re-enable them at all) -- 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