Date: Wed, 21 Jun 2017 10:15:55 -0600 (MDT) From: Warren Block <wblock@wonkity.com> To: Tim Daneliuk <tundra@tundraware.com> Cc: FreeBSD Mailing List <freebsd-questions@freebsd.org> Subject: Re: FreeBSD and Linux SSD Write Speeds Message-ID: <alpine.BSF.2.21.1706211014530.60980@wonkity.com> In-Reply-To: <45657887-638e-bb6d-c318-7046fdea1ca6@tundraware.com> References: <45657887-638e-bb6d-c318-7046fdea1ca6@tundraware.com>
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On Wed, 21 Jun 2017, Tim Daneliuk wrote: > Disclaimer: Tests below run on lightly loaded systems, but results are ... surprising: > > Test Case: dd if=/dev/zero of=foo bs=8M count=512 > > Linux 4.4.0-21-generic on a 2.66GHz Core2 Duo w/8GB memory, older OCZ SSD/ext4: 310MB/sec writes > > FreeBSD 10-STABLE on an 3.2 GHz Quad Core i5 w/8GB memory, newer Kingston SSD/ufs: 210MB/sec writes > > Results are repeatable. > > So, what is the likely culprit making FreeBSD 1/3 slower? The FreeBSD > system does does / nfs exported (which I don't quite yet understand > since all the nfs mount points are below it) at the moment, but there > is little or no nfs traffic. Is Linux doing write caching? They used to do that.
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