Date: Wed, 29 Aug 2018 12:14:25 +0200 From: Harry Schmalzbauer <freebsd@omnilan.de> To: rainer@ultra-secure.de Cc: freebsd-fs@freebsd.org, owner-freebsd-fs@freebsd.org Subject: Re: ZFS (ARC) performance regression in r321610 Message-ID: <3530981a-7a44-6cf8-6fcd-3b44fd364cb7@omnilan.de> In-Reply-To: <1c816966fbe698f0497df231139f9a05@ultra-secure.de> References: <20180827154727.80f92fff9bbc931b37928d43@yamagi.org> <3c6f8c96-6ac9-7257-c8c0-8be2063a7c19@FreeBSD.org> <1c816966fbe698f0497df231139f9a05@ultra-secure.de>
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Am 29.08.2018 um 11:45 schrieb rainer@ultra-secure.de: > Am 2018-08-27 16:19, schrieb Lev Serebryakov: >> On 27.08.2018 16:47, Yamagi Burmeister wrote: >> >>> With this program I was able to bisect the source and identify commit >>> r321610 (MFV r318946: 8021 ARC buf data scatter-ization) as the >>> culprit: >>> https://svnweb.freebsd.org/base?view=revision&revision=321610 >> You could try to set "zfs_abd_scatter_enabled = 0" via kgdb and repeat >> tests to be sure, that this code is a problem. >> >> BTW, it is not clear, that FreeBSD needs this at all. > > > Hi, > > how exactly do I do this? > Maybe this is more/easier applicaple for you: https://svnweb.freebsd.org/changeset/base/338365 Can't really answer your question, but should help getting the desired result :-) -harry
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