| 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: Wed, 10 Jul 2013 13:44:08 +0200 From: Peter Zijlstra <peterz@...radead.org> To: "Yan, Zheng" <zheng.z.yan@...el.com> Cc: linux-kernel@...r.kernel.org, mingo@...e.hu, eranian@...gle.com, ak@...ux.intel.com Subject: Re: [PATCH] perf: Update event buffer tail when overwriting old events On Wed, Jul 10, 2013 at 07:37:43PM +0800, Yan, Zheng wrote: > On 07/08/2013 08:15 PM, Peter Zijlstra wrote: > > On Thu, Jun 06, 2013 at 01:58:06PM +0800, Yan, Zheng wrote: > >> From: "Yan, Zheng" <zheng.z.yan@...el.com> > >> before overwrite mode after overwrite mode > >> AVG 1000 999 1046 1044 > >> STDEV 19.4 19.5 17.1 17.9 > > > > OK, so I was sure I replied to this email; but apparently I didn't :/ > > > > So its still adding about 5% overhead to the regular case; this is sad. > > > > What does something like the below do? > > > > I re-test the patch on a different 32 core sandybridge-ep machine. the result is quite good. > > origin origin overwrite modified modified overwrite > AVG 1000 1044 960 1006 > STDEV 39.0 26.0 28.1 14.4 Nice! -- you did fix the snafu for the overwrite more before testing right? -- 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