svn commit: r202894 - in head/sys/i386: i386 include

[Ivan Voras]

2010/1/26 Alexander Leidinger <Alexander at leidinger.net>:
>
> Quoting John Baldwin <jhb at freebsd.org> (from Mon, 25 Jan 2010 07:57:49
> -0500):
>
>> On Saturday 23 January 2010 1:42:28 pm Alan Cox wrote:
>>>
>>> Author: alc
>>> Date: Sat Jan 23 18:42:28 2010
>>> New Revision: 202894
>>> URL: http://svn.freebsd.org/changeset/base/202894
>>>
>>> Log:
>>>  Handle a race between pmap_kextract() and pmap_promote_pde().  This race
>>> is
>>>  known to cause a kernel crash in ZFS on i386 when superpage promotion is
>>>  enabled.
>>>
>>>  Tested by:    netchild
>>>  MFC after:    1 week
>>
>> Yay!  Should we enable pg_ps by default on i386 now?
>
> Data point, the i386 system where I have superpages enabled is a p4 with
> currently 11 jails active. Some webservers, squid, samba, bind, postfix and
> a lot of portupgrades (during the last days, I'm updating a jail with a
> desktop-setup inside). All jails are on ZFS.

Do you have any method of comparing performance before-and-after?
There was a thread on some of the mailing lists (stable@/current@?)
about squid being the pessimal case for superpages.