Date: Mon, 27 Aug 2018 18:27:23 +0200 From: Yamagi Burmeister <lists@yamagi.org> To: lev@FreeBSD.org Cc: freebsd-fs@freebsd.org, MacCrest@gmail.com Subject: Re: ZFS (ARC) performance regression in r321610 Message-ID: <20180827182723.cd8ec6bac6448793b25ef91c@yamagi.org> 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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[-- Attachment #1 --] On Mon, 27 Aug 2018 17:19:10 +0300 Lev Serebryakov <lev@FreeBSD.org> wrote: > 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. With my testcase this looks very, very good. I'll give it a try in production and report back. That'll take at least 12 hours to be sure that it really works. -- Homepage: https://www.yamagi.org Github: https://github.com/yamagi GPG: 0x1D502515 [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEOXu/lxyufwz0gC5x6xRy5x1QJRUFAluEJmsACgkQ6xRy5x1Q JRXXzg/+K9zUlMg95NoJKxqVk0u08YH7X8Kcw7fvNnLEQNrDvX9BeLjp3I9en0Ar oR6brCV2dId6VshF/ytWOXf7dmNHLlgrWK2DWy1GOk8uQKja/Wg9srWOWXT6PzKO fzdF7y/NQxoDlnd1SJs1LVe3tNZMxJTsB5M1ZMEkTdpnRRuwjgeVDHCC0cNLnwCM En+/KljkYvXTlDGeeZm3dNRCijZUmoSpeJwTzDT4gqRlMwa9kpmqogpqriS2adCd ZhOxsYLCcc9cBfgBD4zDeCdLbJpRYFvuEsZV6+Jvyi75a+gDw69CFLX3gJiTohcA Ij7bHTN3RH4CXrkhF2nBqIN8/PM1HtGLGUmovWH03yf7FeHOVi6Yqt6ytNHxCq8O oCv8QmSwnz1QJEZ5FtQgQ0uLV0jRlBMD29l2rWNu9zh3UsKpWKbleXqJJDAamdsq qzkMrDTZZQFm9yAO4EGnEFPe5t9HrbLBDuDpGuM10WxKN3ffLeoRgaUWAmfWObQT tMiIZqP216b8jOBxH9yPDywnJdPiFZQ6QCgGQ1Vv01dkmuTIWukRcu28yVNQKeew yJg0PWuja8r9W4ffROas2OfKoOLl93Vk5/IIKOWqeMa0TX50hpnn4HP+2QN3jBAB Iwwi3b78ekmYQB0N/XC9B/qxZlflVRc370rHFbNrfb/yEDHZEjc= =jzs8 -----END PGP SIGNATURE-----help
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