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
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Thu, 5 Apr 2018 10:27:01 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Nicholas Piggin <npiggin@...il.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: sched_rt_period_timer causing large latencies

On Thu, Apr 05, 2018 at 09:11:38AM +1000, Nicholas Piggin wrote:
> Hi,
> 
> I'm seeing some pretty big latencies on a ~idle system when a CPU wakes
> out of a nohz idle. Looks like it's due to the taking a lot of remote
> locks and cache lines. irqoff trace:

On RT I think we default RT_RUNTIME_SHARE to false, maybe we should do
the same for mainline. It's always been a dodgy feature and if we ever
figure out how to do FIFO servers this code will be deleted entirely.

Powered by blists - more mailing lists