Date: Wed, 11 Nov 1998 20:57:37 -0700 (MST) From: "Justin T. Gibbs" <gibbs@narnia.plutotech.com> To: Greg Lehey <grog@lemis.com> Cc: hackers@FreeBSD.ORG Subject: Re: SCSI tagged queueing and softupdates Message-ID: <199811120357.UAA06570@narnia.plutotech.com> In-Reply-To: <199811110257.TAA28938@narnia.plutotech.com> <199811110854.BAA07678@usr02.primenet.com> <19981112120754.E463@freebie.lemis.com>
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> Bowrite guarantees that buffers queued after a call to bowrite will > be written after the specified buffer (to a particular device). > Bowrite does this either by taking advantage of hardware ordering support > (e.g. tagged queueing on SCSI devices) or by resorting to a synchronous write. bowrite never does a synchronous write. Both the kernel elevator sort and the SCSI tagged queuing code honor the B_ORDERED flag, so even devices that cannot perform concurrent I/O can safely handled an ordered write in a non-blocking fashion. -- Justin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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