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, 7 Nov 2014 14:40:27 +0800 From: Yuanhan Liu <yuanhan.liu@...ux.intel.com> To: Andy Lutomirski <luto@...capital.net> Cc: LKP <lkp@...org>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [LKP] [x86_64,entry] f04e05b81e4: -62.7% time.user_time On Thu, Nov 06, 2014 at 10:26:23PM -0800, Andy Lutomirski wrote: > On Thu, Nov 6, 2014 at 10:00 PM, LKP <lkp@...org> wrote: > > FYI, we noticed the below changes on > > > > git://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git x86/entry > > commit f04e05b81e4d9ae88bee379f12176f551a24394a ("x86_64,entry: Use sysret to return to userspace when possible") > > > > > > f2ee9bebb99dd4a4 f04e05b81e4d9ae88bee379f12 testbox/testcase/testparams > > ---------------- -------------------------- > > %stddev %change %stddev > > \ | \ > > 24.09 ± 4% -62.7% 8.99 ± 3% lkp-wsx02/aim9/performance-300s-creat-clo > > 24.09 -62.7% 8.99 GEO-MEAN time.user_time > > > > I don't really know how to interpret this. Is this a good thing or a bad thing? TBH, I don't, either. Here we just list the changes we captured, which is then for your information to decide it's good or bad. > > I actually expect this change to be a dramatic speedup for some > workloads. Would you like to share your workload? If so, I can add them to our testing system, and give feedback to you when datat is available. > Any chance you can send me the .config, kernel command > line, and whether you have any tracing features enabled? .config and dmesg are attached. --yliu View attachment "dmesg" of type "text/plain" (311294 bytes) View attachment "config-3.18.0-rc3-wl-ath-g7c130ce" of type "text/plain" (126749 bytes)
Powered by blists - more mailing lists