Date: Sun, 3 Feb 2002 23:54:52 +0100 From: Alex <FreeBSD@cybertron.tmfweb.nl> To: Sam <sam@wa4phy.net> Cc: freebsd-questions@freebsd.org, freebsd-stable@freebsd.org Subject: Re: Normal behavior? Message-ID: <10436337961.20020203235452@cybertron.tmfweb.nl> In-Reply-To: <3C5D4702.661789BA@vortex.wa4phy.net> References: <3C5D4702.661789BA@vortex.wa4phy.net>
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Hello Sam, Sunday, February 03, 2002, 3:19:46 PM, you wrote: S> I'd appreciate some clarification about the behavior of the softupdates S> as it relates to disk writes. Situation: Have noticed that during an S> ftp session with relatively high (150 Kbs) data stream, I notice after S> what appears to be a short burst, i.e., 130 packets (viewed with systat S> -vm) there is a considerable delay before the next batch. Graphicaly S> viewing thruput with xsysinfo, I watch the disk write for each "batch", S> but while the write is happening, there appears to be a significant S> delay before the next packet stream is graphicaly displayed. Is this a S> function of softupdates, combined with the fact that the ATA drive has S> to be serviced by the processor, and the switcher can't service two S> things at once, or what. How often does the data that needs to be S> written actually get written to the disk, or do I misunderstand how S> softupdates works? Essentially, what it appears to me that is S> happening, is the packet stream is "suspended" while the disk is being S> written to. Is that a correct assumption? Since softupdates is on by S> default now, what damage would I do if I turned it off? Is that to my S> best interest? S> Thanks.. S> Sam The days where a OS couldn't handle two things at one (from the users point of view) are passed. So i don't see any reason to conclude the softupdate caussed this. -- Best regards, Alex To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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