Date: Sun, 30 May 2010 23:30:03 GMT From: Garrett Cooper <yanefbsd@gmail.com> To: freebsd-bugs@FreeBSD.org Subject: Re: misc/147227: SSD preformance issues Message-ID: <201005302330.o4UNU3pD061419@freefall.freebsd.org>
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The following reply was made to PR misc/147227; it has been noted by GNATS. From: Garrett Cooper <yanefbsd@gmail.com> To: Brandon Falk <falkman@gamozo.org> Cc: freebsd-gnats-submit@freebsd.org Subject: Re: misc/147227: SSD preformance issues Date: Sun, 30 May 2010 16:25:59 -0700 On Sun, May 30, 2010 at 11:04 AM, Brandon Falk <falkman@gamozo.org> wrote: > >>Number: =A0 =A0 =A0 =A0 147227 >>Category: =A0 =A0 =A0 misc >>Synopsis: =A0 =A0 =A0 SSD preformance issues >>Confidential: =A0 no >>Severity: =A0 =A0 =A0 serious >>Priority: =A0 =A0 =A0 medium >>Responsible: =A0 =A0freebsd-bugs >>State: =A0 =A0 =A0 =A0 =A0open >>Quarter: >>Keywords: >>Date-Required: >>Class: =A0 =A0 =A0 =A0 =A0sw-bug >>Submitter-Id: =A0 current-users >>Arrival-Date: =A0 Sun May 30 18:10:06 UTC 2010 >>Closed-Date: >>Last-Modified: >>Originator: =A0 =A0 Brandon Falk >>Release: =A0 =A0 =A0 =A08.0-RELEASE >>Organization: > Gamozo >>Environment: > FreeBSD localhost 8.0-RELEASE FreeBSD 8.0-RELEASE #0: Sat Nov 21 15:02:08= UTC 2009 =A0 =A0 root@mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC = =A0amd64 >>Description: > I have an SSD that is rated at 285MB/s read, 275MB/s write, and 250MB/s s= ustained 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 dri= ve 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 dri= ve, so it has to be something to do with FreeBSD. >>How-To-Repeat: > Always occurs. >>Fix: > Unknown. > >>Release-Note: >>Audit-Trail: >>Unformatted: This has been discussed at least once on the lists and in the forums. You might want to read through some really quickly google results I came up with: http://old.nabble.com/ATA-4K-sector-issues-td27929909i20.html , http://forums.freebsd.org/showthread.php?t=3D12594 . HTH, -Garrett
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