[c-nsp] N5K (vm.drop_caches)

[Manu Chao]

Thanks Andrew

but NX(OS) is running on top of a specific modified linux kernel we do not
have access :(

sync is not available and echo commands doesn't help (error could not open
temporary file):

N5K# echo 1 > /proc/sys/vm/drop_caches
1
Error: could not open temporary file /bootflash/proc/sys/vm/drop_caches
(errno=2)Error: could not open temporary file /bootflash/pro
c/sys/vm/drop_caches (errno=2)

N5K# echo 2 > /proc/sys/vm/drop_caches
2
Error: could not open temporary file /bootflash/proc/sys/vm/drop_caches
(errno=2)Error: could not open temporary file /bootflash/pro
c/sys/vm/drop_caches (errno=2)

N5K# echo 3 > /proc/sys/vm/drop_caches
3
Error: could not open temporary file /bootflash/proc/sys/vm/drop_caches
(errno=2)Error: could not open temporary file /bootflash/pro
c/sys/vm/drop_caches (errno=2)

:(


On Tue, May 14, 2013 at 12:44 PM, Andrew Miehs <andrew at 2sheds.de> wrote:

> Google is your friend...
>
> https://www.kernel.org/doc/Documentation/sysctl/vm.txt
>
>
> drop_caches
>
> Writing to this will cause the kernel to drop clean caches, dentries and
> inodes from memory, causing that memory to become free.
>
> To free pagecache:
> 	echo 1 > /proc/sys/vm/drop_caches
> To free dentries and inodes:
> 	echo 2 > /proc/sys/vm/drop_caches
> To free pagecache, dentries and inodes:
> 	echo 3 > /proc/sys/vm/drop_caches
>
> As this is a non-destructive operation and dirty objects are not freeable, the
> user should run `sync' first.
>
>
>
> On Tue, May 14, 2013 at 7:55 PM, Manu Chao <linux.yahoo at gmail.com> wrote:
>
>> Any idea about this vm.drop.cache syslog message on Nexus 5548:
>>
>>
>> %AUTHPRIV-5-SYSTEM_MSG:     root : TTY=console ;
>> PWD=/var/sysmgr/sysmgr-subproc ; USER=root ; COMMAND=/sbin/sysctl -q -w
>> vm.drop_caches=3 - sudo
>>
>>
>> Any help will be appreciate
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>
>