In message <20201030224734.gh2...@zxy.spb.ru>, Slawa Olhovchenkov writes: > On Fri, Oct 30, 2020 at 03:34:10PM -0700, Cy Schubert wrote: > > > In message <20201030220809.gg2...@zxy.spb.ru>, Slawa Olhovchenkov writes: > > > On Fri, Oct 30, 2020 at 01:53:10PM -0700, Cy Schubert wrote: > > > > > > > In message <20201030204622.gf2...@zxy.spb.ru>, Slawa Olhovchenkov write > s: > > > > > On Thu, Oct 29, 2020 at 08:13:00PM -0700, Cy Schubert wrote: > > > > > > > > > > > In message <e1kwvlj-0000gy-ic.qroxana-mail...@smtp29.i.mail.ru>, qr > oxan > > > a > > > > > > writes > > > > > > : > > > > > > > > > > > > > > Hi, > > > > > > > > > > > > > > I have an old i386 machine running r364479. After upgrading to > > > > > > > r367045, running kldload zfs.ko freezes the whole system. > > > > > > > > > > > > > > I also tried to replace the 4GB memory with another 2GB one > > > > > > > and kldload zfs.ko works without freezing the machine. > > > > > > > > > > > > ZFS ARC stresses memory. I've found a number of bad RAM chips over > the > > > > > > years using ZFS. > > > > > > > > > > > > The OpenZFS upgrade significantly changed how it manages ARC. It's > like > > > ly > > > > > > that prior to the OpenZFS upgrade your memory wasn't stressed to th > e po > > > int > > > > > > of failure. You can try to mask the problem by reducing your RAM cl > ock > > > rate > > > > > > > > > > > or or increase one of the other latency settings in your BIOS. Howe > ver, > > > > > > > > > again, this only masks an already weak RAM chip. > > > > > > > > > > Sounds like performance drop and regression > > > > > > > > How so. Please explain. > > > > > > More stresses memory usually refers to performance penalty. > > > Usually way for better performance is reduce memory access. > > > > The reason filesystems (UFS, ZFS, EXT4, etc.) cache is to avoid disk > > accesses. Nanoseconds vs milliseconds. > > I mean compared ZoL ZFS ARC vs old (BSD/Opensolaris/Illumos) ZFS ARC. > Any reaason to rise ARC hit rate in ZoL case?
That's what hit rate is. It's a memory access instead of a disk access. That's what you want. -- Cheers, Cy Schubert <cy.schub...@cschubert.com> FreeBSD UNIX: <c...@freebsd.org> Web: https://FreeBSD.org NTP: <c...@nwtime.org> Web: https://nwtime.org The need of the many outweighs the greed of the few. _______________________________________________ freebsd-current@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
