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: Thu, 2 Mar 2017 15:13:56 +0100 From: Rabin Vincent <rabin.vincent@...s.com> To: Rafał Miłecki <rafal@...ecki.pl> Cc: Daniel Lezcano <daniel.lezcano@...aro.org>, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, Srinivas Kandagatla <srinivas.kandagatla@...il.com>, Maxime Coquelin <maxime.coquelin@...com>, Patrice Chotard <patrice.chotard@...com>, tglx@...utronix.de, Hauke Mehrtens <hauke@...ke-m.de> Subject: Re: DIfferent BogoMIPS value after bbaa06702719 ("clocksource/drivers/arm_global_timer: Register delay timer") On Thu, Mar 02, 2017 at 02:36:23PM +0100, Rafał Miłecki wrote: > I just updated kernel on my SmartRG SR400ac (bcm4708-smartrg-sr400ac.dts) from > 4.4 to 4.9 and noticed that this part of the log: > [ 0.020820] Calibrating delay loop... 1594.16 BogoMIPS (lpj=7970816) > (...) > [ 0.190806] Brought up 2 CPUs > [ 0.200022] SMP: Total of 2 processors activated (3188.32 BogoMIPS). > > became: > [ 0.027082] Calibrating delay loop (skipped), value calculated using timer frequency.. 800.00 BogoMIPS (lpj=4000000) > (...) > [ 0.078858] Brought up 2 CPUs > [ 0.088254] SMP: Total of 2 processors activated (1600.00 BogoMIPS). > > This is caused by commit bbaa06702719 ("clocksource/drivers/arm_global_timer: > Register delay timer"). > > Is this something expected? Or should I be worried about this? I'm aware it's > just BogoMIPS, but I still prefer to ask :) Yes, it's expected. No, you shouldn't be worried. It's even explained on Wikipedia: https://en.wikipedia.org/wiki/BogoMips#Timer-based_delays You can run the udelay test (CONFIG_TEST_UDELAY) if you want to make sure that your delay loops are fine.
Powered by blists - more mailing lists