Date: Tue, 26 Jan 2010 14:15:25 +0100 From: Alexander Leidinger <Alexander@Leidinger.net> To: John Baldwin <jhb@freebsd.org> Cc: Alan Cox <alc@freebsd.org>, svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r202894 - in head/sys/i386: i386 include Message-ID: <20100126141525.10365e5dzlk7jc4k@webmail.leidinger.net> In-Reply-To: <201001250757.49334.jhb@freebsd.org> References: <201001231842.o0NIgSa5086957@svn.freebsd.org> <201001250757.49334.jhb@freebsd.org>
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Quoting John Baldwin <jhb@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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