Date: Wed, 29 May 2013 14:11:39 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Oliver Fromme" <olli@lurza.secnetix.de>, <freebsd-stable@FreeBSD.ORG> Subject: Re: 9.1-stable: ATI IXP600 AHCI: CAM timeout Message-ID: <A33AC77B8D0042C08A5AE7E52EA8279D@multiplay.co.uk> References: <201305291305.r4TD5DAP037954@grabthar.secnetix.de>
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Have you checked your sata cables and psu outputs? Both of these could be the underlying cause of poor signalling. ----- Original Message ----- From: "Oliver Fromme" <olli@lurza.secnetix.de> To: <freebsd-stable@FreeBSD.ORG> Sent: Wednesday, May 29, 2013 2:05 PM Subject: Re: 9.1-stable: ATI IXP600 AHCI: CAM timeout Now I have some more information ... The problem disappears when I disable NCQ, i.e. set the number of tags to 1 with camcontrol. Using binary search I found out that the problem also disappears with 2 tags, but with 3 tags I get the same amout of errors as with the default of 32 tags. Interestingly, the problems also disappears when I reduce the SATA level from II to I (i.e. from 3 to 1.5 Gbit/s), even if the NCQ tags are left at the default of 32. Now the question is: Is it better to reduce the NCQ tags from 32 to 2, or to reduce the SATA bandwidth from 3 Gbps to 1.5 Gbps? What is more likely to impact performance on a mixed server with shell users, apache, sendmail, DNS and a few other things? Best regards Oliver -- Oliver Fromme, secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing Handelsregister: Amtsgericht Muenchen, HRA 74606, Geschäftsfuehrung: secnetix Verwaltungsgesellsch. mbH, Handelsreg.: Amtsgericht München, HRB 125758, Geschäftsführer: Maik Bachmann, Olaf Erb, Ralf Gebhart FreeBSD-Dienstleistungen/-Produkte + mehr: http://www.secnetix.de/bsd In my experience the term "transparent proxy" is an oxymoron (like jumbo shrimp). "Transparent" proxies seem to vary from the distortions of a funhouse mirror to barely translucent. I really, really dislike them when trying to figure out the corrective lenses needed with each of them. -- R. Kevin Oberman, Network Engineer _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" ================================================ This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. In the event of misdirection, illegible or incomplete transmission please telephone +44 845 868 1337 or return the E.mail to postmaster@multiplay.co.uk.
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