From owner-freebsd-hackers Wed Mar 22 03:54:36 1995 Return-Path: hackers-owner Received: (from majordom@localhost) by freefall.cdrom.com (8.6.10/8.6.6) id DAA02888 for hackers-outgoing; Wed, 22 Mar 1995 03:54:36 -0800 Received: from godzilla.zeta.org.au (godzilla.zeta.org.au [203.2.228.34]) by freefall.cdrom.com (8.6.10/8.6.6) with ESMTP id DAA02880 for ; Wed, 22 Mar 1995 03:54:13 -0800 Received: (from bde@localhost) by godzilla.zeta.org.au (8.6.9/8.6.9) id VAA12384; Wed, 22 Mar 1995 21:49:25 +1000 Date: Wed, 22 Mar 1995 21:49:25 +1000 From: Bruce Evans Message-Id: <199503221149.VAA12384@godzilla.zeta.org.au> To: bde@zeta.org.au, davidg@Root.COM Subject: Re: Why IDE is bad Cc: freebsd-hackers@freefall.cdrom.com, kuku@gilberto.physik.rwth-aachen.de Sender: hackers-owner@FreeBSD.org Precedence: bulk >>This might explain why my Intr time is so much lower than Poul's. >>I have only 16MB, and don't use option BOUNCE_BUFFERS. The bcopy() >>for bouncing is done in a call from biodone(). biodone() is called >>from the interrupt handler, at least for the wd driver. > Bounce buffers are not used on wd-style drives. I just looked at wd.c because there's no direct call to biodone() in bt742a.c. I think it gets called from the upper layers for scsi drivers. Bruce