Date: Wed, 29 Aug 2018 11:45:45 +0200 From: rainer@ultra-secure.de To: lev@freebsd.org Cc: Yamagi Burmeister <lists@yamagi.org>, freebsd-fs@freebsd.org, MacCrest@gmail.com, owner-freebsd-fs@freebsd.org Subject: Re: ZFS (ARC) performance regression in r321610 Message-ID: <1c816966fbe698f0497df231139f9a05@ultra-secure.de> In-Reply-To: <3c6f8c96-6ac9-7257-c8c0-8be2063a7c19@FreeBSD.org> References: <20180827154727.80f92fff9bbc931b37928d43@yamagi.org> <3c6f8c96-6ac9-7257-c8c0-8be2063a7c19@FreeBSD.org>
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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? Best Regards Rainer
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