Date: Mon, 27 Aug 2018 17:19:10 +0300 From: Lev Serebryakov <lev@FreeBSD.org> To: Yamagi Burmeister <lists@yamagi.org>, freebsd-fs@freebsd.org Cc: MacCrest@gmail.com Subject: Re: ZFS (ARC) performance regression in r321610 Message-ID: <3c6f8c96-6ac9-7257-c8c0-8be2063a7c19@FreeBSD.org> In-Reply-To: <20180827154727.80f92fff9bbc931b37928d43@yamagi.org> References: <20180827154727.80f92fff9bbc931b37928d43@yamagi.org>
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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. -- // Lev Serebryakov
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