Date: Tue, 6 Dec 2016 19:12:58 +0200 From: Andriy Gapon <avg@FreeBSD.org> To: Alex Tutubalin <lexa@lexa.ru>, freebsd-fs@FreeBSD.org Subject: Re: 11-STABLE vs 11.0-RELENG test Message-ID: <dd8f644b-8555-f8ad-a18a-58e2a28cc209@FreeBSD.org> In-Reply-To: <a10b10ed-9200-26f3-5ca4-976a13922dee@lexa.ru> References: <477264f9-9263-6df8-4566-2911e84f2ad8@lexa.ru> <a10b10ed-9200-26f3-5ca4-976a13922dee@lexa.ru>
next in thread | previous in thread | raw e-mail | index | archive | help
On 06/12/2016 18:17, Alex Tutubalin wrote: > Followup, same box as in 1st message, but with different HBA and 5 HDD: > > Summary: > 1) read speed depends on 'on-disk' data, not by code used while read. > 2) FreeBSD 11.0-releng (svn up today) creates 'fast' big files (420+ Mb/s read > speed) > 3) FreeBSD 11-STABLE creates 'slow' big files. (~200 Mb/s) > 4) zfs send slow-dataset | zfs recv (under 11.0-releng) creates > 'intermediate' files (320Mb/s) > 5) file copy slow-file ... (under 11.0-releng) creates fast copy (400+Mb/s) > > So, ZFS write code in 11-STABLE looks broken. > > Here detailed log of my tests: > > Box: Intel i5-2400, 16Gb of RAM, Adaptec 5805, 5x4Tb drives (HGST NAS drives) in > JBOD, merged in RAIDZ2, enough free space: > $ zpool list > NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT > zdata 18,1T 5,11T 13,0T - 9% 28% 1.00x ONLINE - That's an interesting observation. Could you please try starting with a freshly created pool and writing some data? I wonder if 'zpool list -v' will show any significant differences between different FreeBSD versions? Another thing to check would be 'zdb -mm' but it could be very large. However, a difference should be sufficiently small as most of the space would remain unused. And, just in case, please compare 'zpool get all' and 'zfs get all' between those two versions. -- Andriy Gapon
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?dd8f644b-8555-f8ad-a18a-58e2a28cc209>