Date: Sun, 30 May 2010 18:04:00 GMT From: Brandon Falk <falkman@gamozo.org> To: freebsd-gnats-submit@FreeBSD.org Subject: misc/147227: SSD preformance issues Message-ID: <201005301804.o4UI40FG052550@www.freebsd.org> Resent-Message-ID: <201005301810.o4UIA6BO023256@freefall.freebsd.org>
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>Number: 147227 >Category: misc >Synopsis: SSD preformance issues >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Sun May 30 18:10:06 UTC 2010 >Closed-Date: >Last-Modified: >Originator: Brandon Falk >Release: 8.0-RELEASE >Organization: Gamozo >Environment: FreeBSD localhost 8.0-RELEASE FreeBSD 8.0-RELEASE #0: Sat Nov 21 15:02:08 UTC 2009 root@mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64 >Description: I have an SSD that is rated at 285MB/s read, 275MB/s write, and 250MB/s sustained write. On Linux, I easily sustain all these speeds, but on FreeBSD I happen to only get about 108 MB/s write, and 116MB/s read. Another thing I noticed is that my drive is only running at SATA 150, even though my drive is SATA 300 and my controller is also detected as SATA 300. *snip from dmesg* atapci1: <Intel ICH7 SATA300 controller> port 0xc400-0xc407,0xc080-0xc083,0xc000-0xc007,0xbc00-0xbc03,0xb880-0xb88f irq 19 at device 31.2 on pci0 ad4: 47703MB <OCZ VERTEX2 1.00> at ata2-master SATA150 *snip from dmesg* I do not have an AHCI setting in my BIOS, so that is not something that I can change, but still Linux happens to preform perfectly fine with the drive, so it has to be something to do with FreeBSD. >How-To-Repeat: Always occurs. >Fix: Unknown. >Release-Note: >Audit-Trail: >Unformatted:
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