Date: Tue, 8 Aug 2000 10:20:20 -0500 (CDT) From: Steven Timm <timm@fnal.gov> To: aic7xxx@freebsd.org Subject: Write speeds with AIC-7899 SCSI driver Message-ID: <Pine.LNX.4.21.0008081015140.13354-100000@sapphire.fnal.gov>
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A couple of weeks ago I posted to this list that I had been having problems with a AIC-7899 Ultra-160 SCSI controller under Linux. Symptom of the problem was that write speeds were slow, < 10 Mb/sec, although the bus and drives should have been good for at least 30 MB/sec. Later versions of the driver (5.1.30,5.1.31) and later kernels 2.2.16 and greater were even worse. The problem still persists under Linux but I have now loaded FreeBSD on the machine as well (from which I understand Linux derives this particular driver) and the performance was fine..32 MB/sec write and 33 MB/sec read using bonnie, which is essentially the hardware limit of the Seagate Cheetah drive as I understand it. Does someone know why a driver with similar parentage would behave under FreeBSD but not under Linux? Perhaps this will help someone sort out the problem. The non-performance under Linux cost the vendor a contract. ------------------------------------------------------------------ Steven C. Timm (630) 840-8525 timm@fnal.gov http://home.fnal.gov/~timm/ Fermilab Computing Division/Operating Systems Support Central Systems Support Group--Computing Farms Operations To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe aic7xxx" in the body of the message
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