Date: Wed, 21 Jun 2017 11:45:49 -0500 From: Adam Vande More <amvandemore@gmail.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: <CA%2BtpaK13e-wLQfHMrN0902UcKMfx7syFxOjA_U0Z=MAwgLMRag@mail.gmail.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, Jun 21, 2017 at 11:04 AM, Tim Daneliuk <tundra@tundraware.com> 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. > SSD speeds can vary greatly based upon models. What steps did you take to ensure the rates you are seeing aren't completely normal? -- Adam
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