Date: Wed, 21 Jun 2017 13:33:36 -0500 From: Tim Daneliuk <tundra@tundraware.com> To: FreeBSD Mailing List <freebsd-questions@freebsd.org> Subject: Re: FreeBSD and Linux SSD Write Speeds Message-ID: <3a2eabbe-1bef-5c56-f7af-8f054baa87e5@tundraware.com> In-Reply-To: <41839.128.135.52.6.1498062473.squirrel@cosmo.uchicago.edu> References: <45657887-638e-bb6d-c318-7046fdea1ca6@tundraware.com> <41839.128.135.52.6.1498062473.squirrel@cosmo.uchicago.edu>
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On 06/21/2017 11:27 AM, Valeri Galtsev wrote: > sync; date; dd if=/dev/zero of=foo bs=8M count=512; sync; date So I just did this: sync; date; dd if=/dev/zero of=foo bs=8M count=1024; sync; date And got this: Linux: Wed Jun 21 13:30:22 CDT 2017 1024+0 records in 1024+0 records out 8589934592 bytes (8.6 GB, 8.0 GiB) copied, 33.523 s, 256 MB/s Wed Jun 21 13:30:57 CDT 2017 FreeBSD: Wed Jun 21 13:28:23 CDT 2017 1024+0 records in 1024+0 records out 8589934592 bytes transferred in 46.508336 secs (184696666 bytes/sec) Wed Jun 21 13:29:10 CDT 2017 So ... still a pretty big disparity I don't want to test against a raw device or partition because that's not how these systems get used. My FreeBSD FS is UFS and maybe that simply is not as efficient on an SSD as ext4. This isn't a big deal, just an eyebrow raiser for me. I've used FreeBSD as a production OS since 2.x and have always found it to be consistently quicker and have a smaller footprint than Linux. This was just a surprise. -- ---------------------------------------------------------------------------- Tim Daneliuk tundra@tundraware.com PGP Key: http://www.tundraware.com/PGP/
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