Date: Mon, 05 Oct 1998 13:26:46 -0700 From: Greg Hutchison <gregh@nw.imagestat.com> To: Michael Kunze <mkunze@ivw.de> Cc: "aic7xxx@FreeBSD.ORG" <aic7xxx@FreeBSD.ORG> Subject: Re: Ultra2 transfer mode? Message-ID: <36192B86.ED972E99@nw.imagestat.com> References: <36190ABA.C835F0B8@ivw.de>
next in thread | previous in thread | raw e-mail | index | archive | help
Michael Kunze wrote: > > Hi all, > > pre 15 works for me without problems on an Asus P2B-LS. There is still a > question left i asked some mails ago. If i take a look into > /proc/scsi/aic7xxx/0, i see > > Statistics: > (scsi0:0:0:0) > Device using Wide/Async transfers. > ^ ^ ^ ^ > Device Negotiation Settings > Period Offset Bus Width > User 000 000 1 > Goal 000 000 1 > Current 000 000 1 > Total transfers 3595 (3370 read;225 written) > blks(512) rd=16267; blks(512) wr=654 > > This should be definitely synchronous, because the harddisk is an IBM > DGHS09V Ultra2-SCSI, which of course is capable of ultra2 synchronous > transfers. > > So, what is the REAL transfer mode? 80 Mbyte/s synchronous or 20 MByte/s > or > less asynchronous? > less asynch :( I just sorted this out here this morning on three separate systems with pre-15 and IBM Ultrastar drives. Drives are variously FastWide (Ultrastar XP and 2XP) and Ultra Fast Wide (Ultrastar 2XP and Ultrastar 9ZX). Two of the systems are ASUS P2B-DS's with onboard AIC7890 controllers, the other uses an onboard AIC7880. In all case with pre-15, the IBM drives were reporting as Wide/Async where other drives (Quantum Atlas) were reporting Wide/Sync. Jumpering all the Ultrastars to 'Disable Target Initiated Synchronous Negotiation', (forcing the initiator to negotiate for Synchronous and/or wide transfers), corrected the behavior of the pre-15 driver - all drives are now reported as Wide/Synchronous at 20Mb/s or 40Mb/s as appropriate. Earlier revisions of the driver behaved differently. Some negotiated sync/wide UNLESS tagged queuing was turned on. Tests with Bonnie show that thruput more than doubled with the, (shouldn't be necessary), jumper change. Greg H. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-aic7xxx" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?36192B86.ED972E99>