Date: Wed, 22 Jan 2003 19:44:22 -0800 (PST) From: Noah Garrett Wallach <sleek@enabled.com> To: Dan Nelson <dnelson@allantgroup.com> Cc: freebsd-questions@FreeBSD.ORG, canton <canton@enabled.com> Subject: Re: iostat - define Kilobits per transfer Message-ID: <20030122193922.C76039@typhoon.enabled.com> In-Reply-To: <20030123032816.GA1799@dan.emsphone.com> References: <20030122191542.J76039@typhoon.enabled.com> <20030123032816.GA1799@dan.emsphone.com>
next in thread | previous in thread | raw e-mail | index | archive | help
> > > I currently have an IDE drive that has the capacity to do 128KB/t and > > a SCSI drive 64KB/t. Are these stats in fact showing me that there > > is a limitation with the SCSI drive? Are my file transfering > > capaibilities less with the SCSI drive? I suppose what do I need to > > look for in the spcifications when choosing new drives so this does > > not happen again? > > FreeBSD's SCSI layer has a cap of 64k per transaction (apparently > because ancient ISA adapters could not do more than 64k), and the ATA > layer has a cap of 128k. You won't see a difference using regular > disks. A 20MB/sec transfer rate comes out to ~300 64K > transactions/sec, which most systems should be able to handle with no > problems. so what exactly does KB per transaction mean? what happens if I am handling 300 concurrent users with 160Kbit encoded audio streams - could I in fact do this on this machine? or will I be limited by the 64KB/t issue? - Noah > > -- > Dan Nelson > dnelson@allantgroup.com > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20030122193922.C76039>