Date: Mon, 17 Nov 2014 18:17:17 +0800 From: k simon <moremore2@outlook.com> To: freebsd-scsi@freebsd.org Subject: HDD slow down in heavy load Message-ID: <BLU436-SMTP193623C93FF6EEF15E339F2EE8B0@phx.gbl>
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Hi, List, I observed sometimes DragonflyBSD do much better than FB in heavy load , eg. squid or zabbix's postgresql database. The difference may related to DFBSD have enhanced CAM DA driver to separate read and write streams, allowing concurrent write completion in the face of many stalled read requests. It's released within DFBSD V2.10 at 2011: http://leaf.dragonflybsd.org/mailarchive/commits/2011-04/msg00062.html http://leaf.dragonflybsd.org/mailarchive/commits/2011-04/msg00061.html I guess I'm alone for notice it. Regards Simon
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