Date: Thu, 14 Aug 2003 09:26:17 +0400 (MSD) From: Maxim Konovalov <maxim@macomnet.ru> To: Alexander Serkov <serkov@ukrpost.net> Cc: freebsd-hackers@freebsd.org Subject: Re: Why is ATAPI DMA disabled by default ? Message-ID: <20030814092542.G10062@news1.macomnet.ru> In-Reply-To: <200308140145.45882.serkov@ukrpost.net> References: <200308140145.45882.serkov@ukrpost.net>
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On Thu, 14 Aug 2003, 01:45+0300, Alexander Serkov wrote: > I use 5.1-current and have found that by default FreeBSD disables ATAPI's > support for DMA transfers and thus uses CPU hungry PIO modes. > It even makes sysctl used to change this read-only. > I had changed the default value of atapi_dma to 1 in dev/ata/atapi-all.c to 1 > and it worked fine for me. Hint: put hw.ata.atapi_dma="1" in /boot/loader.conf. -- Maxim Konovalov, maxim@macomnet.ru, maxim@FreeBSD.org
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