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>] [day] [month] [year] [list]
Message-ID: <1437552576.2783.19.camel@googlemail.com>
Date:	Wed, 22 Jul 2015 10:09:36 +0200
From:	Sebastian Poehn <sebastian.poehn@...il.com>
To:	netdev@...r.kernel.org
Subject: [PATCH] Documentation: Mention chunk format for irq affinity

It may not be obvious for everyone that bitmasks in proc require
32bit chunking
    
Signed-off-by: Sebastian Poehn <sebastian.poehn@...il.com>
---
 Documentation/IRQ-affinity.txt | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/IRQ-affinity.txt b/Documentation/IRQ-affinity.txt
index 01a6751..d873dab 100644
--- a/Documentation/IRQ-affinity.txt
+++ b/Documentation/IRQ-affinity.txt
@@ -55,6 +55,11 @@ round-trip min/avg/max = 0.1/0.5/585.4 ms
 This time around IRQ44 was delivered only to the last four processors.
 i.e counters for the CPU0-3 did not change.
 
+Note that you have to split the bitmask to chunks when using more that 32 cpus:
+[root@...n 44]# echo 80,00000000 > smp_affinity
+[root@...n 44]# cat smp_affinity
+80,00000000
+
 Here is an example of limiting that same irq (44) to cpus 1024 to 1031:
 
 [root@...n 44]# echo 1024-1031 > smp_affinity_list
-- 
2.4.3
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ