Date: Wed, 27 Jan 2010 09:26:06 +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, Ivan Voras <ivoras@freebsd.org> Subject: Re: svn commit: r202894 - in head/sys/i386: i386 include Message-ID: <20100127092606.19093xuevmlx4xpc@webmail.leidinger.net> In-Reply-To: <201001261507.21399.jhb@freebsd.org> References: <201001231842.o0NIgSa5086957@svn.freebsd.org> <20100126141525.10365e5dzlk7jc4k@webmail.leidinger.net> <9bbcef731001260905u36436624rfcf466765eee1f6a@mail.gmail.com> <201001261507.21399.jhb@freebsd.org>
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Quoting John Baldwin <jhb@freebsd.org> (from Tue, 26 Jan 2010 15:07:21 -0500): > On Tuesday 26 January 2010 12:05:29 pm Ivan Voras wrote: >> 2010/1/26 Alexander Leidinger <Alexander@leidinger.net>: >> > >> > 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. >> >> 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. > > The thread did not say that superpages made squid slower, rather that due to > the way it forked to execute the log rotation binaries, some superpages were > demoted back to regular pages losing the gain of superpages for those pages. Additionally: - this is my server at home (limited amount of users accessing it) - I changed too much at once which may affect the performance (superpages, ATA_CAM, zfs-kernel-settings) Apart from that: I have no performance numbers for this machine. Bye, Alexander. -- Fresco's Discovery: If you knew what you were doing you'd probably be bored. http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7 http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137
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