From: Jens Axboe <axboe@suse.de>
To: David Brownell <david-b@pacbell.net>
Cc: Matthew Dharm <mdharm-kernel@one-eyed-alien.net>,
linux-kernel@vger.kernel.org,
linux-usb-devel@lists.sourceforge.net, Greg KH <greg@kroah.com>
Subject: Re: [linux-usb-devel] Re: highmem and usb [was: "sr: unaligned transfer" in 2.5.2-pre1]
Date: Wed, 2 Jan 2002 10:31:14 +0100 [thread overview]
Message-ID: <20020102103114.A28530@suse.de> (raw)
In-Reply-To: <20011223112249.B4493@kroah.com> <m23d1trr4w.fsf@pengo.localdomain> <20011230122756.L1821@suse.de> <20011230212700.B652@one-eyed-alien.net> <20011231125157.D1246@suse.de> <20011231145455.C6465@one-eyed-alien.net> <065e01c192fd$fe066e20$6800000a@brownell.org> <20020101233423.I16092@suse.de> <20020101152859.D14915@one-eyed-alien.net> <06df01c1934f$ee4e68a0$6800000a@brownell.org>
In-Reply-To: <06df01c1934f$ee4e68a0$6800000a@brownell.org>
On Tue, Jan 01 2002, David Brownell wrote:
> > > No, you can always ask to get pages low mem bounced. Highmem is no
> > > requirement, and if your device really can't support it there's no point
> > > in attempting to support it.
> >
> > I presume there is some overhead in bouncing to lowmem? I imagine that
> > highmem support for the HCDs wouldn't be that difficult -- they are just
> > PCI devices, after all.
>
> I'm unclear on what "bouncing to lowmem" involves, but I'd rather avoid
> teaching all three HCDs a second model for addressing transfer buffers.
>
> At least until later in the 2.5 series, when we believe they'll share a lot
> more common code and so that new model can be taught to just ONE
> piece of code. Fixing bugs in one place easier than in three!
Ehm I was discussing 2.5, 2.4 will always bounce the high mem pages for
you so it's moot there.
--
Jens Axboe
next prev parent reply other threads:[~2002-01-02 9:31 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-12-23 17:44 "sr: unaligned transfer" in 2.5.2-pre1 Peter Osterlund
2001-12-23 19:22 ` Greg KH
2001-12-30 9:31 ` Peter Osterlund
2001-12-30 11:27 ` Jens Axboe
2001-12-31 5:27 ` Matthew Dharm
2001-12-31 11:51 ` Jens Axboe
2001-12-31 22:54 ` [linux-usb-devel] " Matthew Dharm
2001-12-31 23:59 ` Andre Hedrick
2002-01-01 17:39 ` Jens Axboe
2002-01-01 17:40 ` Jens Axboe
2002-01-01 19:53 ` David Brownell
2002-01-01 22:34 ` Jens Axboe
2002-01-01 23:28 ` Matthew Dharm
2002-01-02 5:40 ` [linux-usb-devel] Re: highmem and usb [was: "sr: unaligned transfer" in 2.5.2-pre1] David Brownell
2002-01-02 9:27 ` [linux-usb-devel] Re: highmem and usb [was:"sr: unalignedtransfer" " Oliver.Neukum
2002-01-02 18:43 ` David Brownell
2002-01-02 9:31 ` Jens Axboe [this message]
2002-01-02 9:30 ` [linux-usb-devel] Re: "sr: unaligned transfer" in 2.5.2-pre1 Jens Axboe
2002-01-02 5:27 ` [linux-usb-devel] Re: highmem and usb [was "sr: unaligned transfer" in 2.5.2-pre1] David Brownell
2002-01-02 9:32 ` Jens Axboe
2002-01-02 18:37 ` David Brownell
2002-01-02 18:44 ` Jens Axboe
2002-01-02 18:55 ` David Brownell
2002-01-02 20:23 ` Jens Axboe
2002-01-02 22:32 ` [linux-usb-devel] Re: highmem and usb [was "sr: unalignedtransfer" " Oliver.Neukum
2001-12-24 4:05 ` "sr: unaligned transfer" in 2.5.2-pre1 Bob_Tracy
2001-12-24 7:24 ` Peter Osterlund
2001-12-24 14:13 ` WHICH MACHINE????? Astinus
2001-12-24 15:37 ` Erik Mouw
2001-12-25 15:41 ` Svein Ove Aas
2001-12-26 13:56 ` Erik Mouw
2001-12-24 16:19 ` J.A. Magallon
2001-12-24 22:48 ` "sr: unaligned transfer" in 2.5.2-pre1 Peter Osterlund
2001-12-27 7:13 ` Petr Titera
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