Quoting John Baldwin <j...@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.
# uptime
2:01pm up 3 days, 21:52, 2 users, load averages: 1.34, 1.14, 1.09
It is not more because I switched to ATA_CAM after more than a day of
uptime with the code of this commit.
# sysctl vm.pmap
vm.pmap.pmap_collect_active: 0
vm.pmap.pmap_collect_inactive: 0
vm.pmap.pv_entry_spare: 54584
vm.pmap.pv_entry_allocs: 504637278
vm.pmap.pv_entry_frees: 504575270
vm.pmap.pc_chunk_tryfail: 0
vm.pmap.pc_chunk_frees: 22566325
vm.pmap.pc_chunk_allocs: 22566672
vm.pmap.pc_chunk_count: 347
vm.pmap.pv_entry_count: 62008
vm.pmap.pde.promotions: 2080074
vm.pmap.pde.p_failures: 22736249
vm.pmap.pde.mappings: 0
vm.pmap.pde.demotions: 2080038
vm.pmap.shpgperproc: 200
vm.pmap.pv_entry_max: 1487136
vm.pmap.pg_ps_enabled: 1
Bye,
Alexander.
--
When eating an elephant take one bite at a time.
http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7
http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137
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