Date: Wed, 28 Apr 2010 09:35:17 +0200 From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no> To: Alexander Motin <mav@FreeBSD.org> Cc: Maxim Sobolev <sobomax@FreeBSD.org>, FreeBSD-Current <freebsd-current@FreeBSD.org>, Richard Tector <richardtector@thekeelecentre.com>, freebsd-geom@FreeBSD.org Subject: Re: Switchover to CAM ATA? Message-ID: <86wrvst4ga.fsf@ds4.des.no> In-Reply-To: <4BD6F797.5090205@FreeBSD.org> (Alexander Motin's message of "Tue, 27 Apr 2010 17:41:27 %2B0300") References: <4BD06BD9.6030401@FreeBSD.org> <4BD099E6.6000402@FreeBSD.org> <4BD0A689.8000508@thekeelecentre.com> <4BD0ACD2.3040805@FreeBSD.org> <86och53tpl.fsf@ds4.des.no> <4BD6EDD6.8010403@FreeBSD.org> <86fx2h3rr6.fsf@ds4.des.no> <4BD6F797.5090205@FreeBSD.org>
next in thread | previous in thread | raw e-mail | index | archive | help
Alexander Motin <mav@FreeBSD.org> writes: > I haven't dug really deep into current ataraid(4), but AFAIK it is all > done in software. At least there is no any offloading support on the > controller drivers level. None of ata(4) drivers do anything except > executing one ATA command at a time. Correct. That doesn't mean they *shouldn't* use offloading. Like I said, I started working on checksum offloading for Promise SATA controllers, but ZFS came along and I replaced the controllers because of data corruption issues (which turned out to be either a driver bug or a PCI timing bug which sos@ worked around in the driver, I forget which) > Any URLs? Google "Promise FastTrak SATA RAID" I have two or three of those, including one with on-board SDRAM (but no battery backup) DES --=20 Dag-Erling Sm=C3=B8rgrav - des@des.no
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?86wrvst4ga.fsf>