| 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: <5552A84B.3020707@acm.org> Date: Tue, 12 May 2015 21:26:35 -0400 From: Ed Cashin <ed.cashin@....org> To: Arnd Bergmann <arnd@...db.de> CC: Tina Ruchandani <ruchandani.tina@...il.com>, y2038@...ts.linaro.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] aoe: Use 64-bit timestamp in frame On 05/12/2015 05:44 AM, Arnd Bergmann wrote: > On Monday 11 May 2015 21:00:25 Ed Cashin wrote: ... > In that case, there is still information about the timing embedded in > the AoE tag. The send time in jiffies is a rough-grained record of the > send time, and it's extracted from the tag. For these "unexpected" > responses, this timing information can improve performance significantly > without introducing extra overhead or risk. > That path is not changed at all by this patch, right? It also looks > like the jiffies information from there is only used to print an > error message. > That's right, thanks, the tag still has the old jiffies embedded in it. The information, though, is used to update the round-trip-time average and the running estimate of the RTT variance. For the unexpected responses that information can help the driver to maintain high performance when there are inconsistencies in the network performance. (calc_rttavg) -- Ed -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists