Date: Tue, 6 Apr 1999 13:26:06 -0400 From: Christopher Michaels <ChrisMic@clientlogic.com> To: 'Ken Brownfield' <kenb@irridia.com>, freebsd-questions@freebsd.org Subject: RE: Disk I/O crushes Ethernet I/O (3.0R) Message-ID: <6C37EE640B78D2118D2F00A0C90FCB441A6001@site2s1>
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> -----Original Message----- > From: Ken Brownfield [SMTP:kenb@irridia.com] > Sent: Tuesday, April 06, 1999 1:16 PM > To: freebsd-questions@freebsd.org > Subject: Re: Disk I/O crushes Ethernet I/O (3.0R) > > Karl Pielorz: > |Ken: > |> During periods of disk activity (copying a large file, etc.) all > |> network traffic virtually comes to a halt. If I run the cp during > |> an FTP file transfer, my network transfer rate is dropped by about > |> 80%. Other network services suffer the same massive packet > |> deprivation. > | > |Are you using DMA with the IDE drive? (and are you _sure_ your using DMA > with > |the IDE drive? :) > > Do you mean within the mobo BIOS, or an "optional" kernel option? If the > former, I'm pretty sure it's cranked up. If the latter, I don't know. > (Where's a good place to get flags info for the wd driver?) > They are documented in the LINT kernel config file. > But I'll verify that, thanks. > > |I have a similar setup here (Dual P-Pro, 256Mb RAM, fxp0, IDE + SCSI). > The IDE > |drives suck, even with DMA etc. - they're no match for 'decent' SCSI > drives > |(but they are cheap). They're OK for 'straight line speed', but I find > for > [...] > > Yes, I'm a SCSI zealot myself, but even given IDE it shouldn't completely > crush network throughput -- it doesn't hurt other operating systems at > all... > I agree, and while I may not be pushing my IDE drives to the limit, I have never seen a problem like this on my system. Network performance seems to be stable when there is significant disk access. > If the 3.1R upgrade and IRQ/BIOS tweaking doesn't solve it, I'll probably > upgrade to SCSI. > > Thanks for the help, and any help anyone else can offer, > -- > Ken. > kenb@irridia.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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