Date: Tue, 20 Jan 2009 21:48:15 GMT From: Daniel Tourde <daniel.tourde@caelae.se> To: freebsd-gnats-submit@FreeBSD.org Subject: misc/130794: hw.ata.ata_dma_limit without any effect Message-ID: <200901202148.n0KLmFqx044467@www.freebsd.org> Resent-Message-ID: <200901202150.n0KLo3JH011767@freefall.freebsd.org>
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>Number: 130794 >Category: misc >Synopsis: hw.ata.ata_dma_limit without any effect >Confidential: no >Severity: non-critical >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Tue Jan 20 21:50:03 UTC 2009 >Closed-Date: >Last-Modified: >Originator: Daniel Tourde >Release: 7.1 >Organization: >Environment: FreeBSD 7.1-RELEASE #0 GENERIC amd64 >Description: Hi! I need to slow down the UDMA on my Hard Drive. It is set automatically to UDMA133 which causes a lot of warnings and if I bring it to UDMA100, the warning and the error messages disappear. To do so, 2 options: - The inelegant: atacontrol mode ad0 UDMA5 - The elegant: put hw.ata.ata_dma_limit="5" in loader.conf I am very tempted by the elegant solution but unfortunately it does not work. It has absolutely no effect whatsoever... :( sysctl hw.ata.ata_dma_limit="5" gives sysctl: unknown oid 'hw.ata.ata_dma_limit' I think it is a bug... Daniel >How-To-Repeat: >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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