--- Rob van der Heij <[EMAIL PROTECTED]> wrote: > On Mon, 11 Oct 2004 12:36:29 -0700, Johnny Walton > <[EMAIL PROTECTED]> wrote: > > > > > > I'm using plain ole mv. The virtual machine is > 512M > > and the data is a single file that is 650M. The > > source nad destination are on seperate volumes. > What > > I'm seeing in iostat is nothing being written or > read > > "0 rkB/S 0wkB/s" for quite some time big await's > then > > I see a flurry of activity and await goes down but > > starts getting larger and larger because nothing > is > > being written. Then the cycle starts again. > > I have some concerns about whether the numbers from > iostat are > accurate in timing. But the behaviour you mention > looks like all > memory filled with data read from disk, and waiting > for more memory to > be freed up. But that happens only when the dirty > pages are flushed > out. As long as there is no huge amount of dirty > data, it will flush > small amounts every 5 seconds. Maybe you could > verify that with > /proc/meminfo?
This is indeed happening. > Could you give it a try and lower some of the limits > in > /proc/sys/vm/bdflush (e.g. the percentage at which > the flush goes into > continuous mode). I can't seem to remember what all these entries mean. But I have a fresh copy of sg246926 that I am going over to refresh my memory. I will have a report tomorrow. Thanks for sticking with me on this. > > I do have some plumbing that we could use to digest > TRSOURCE and/or CP > TRACE output to see what I/O took how long and when > they were issued, > etc. But that is heavy work. > > > I'll let you borrow my redbooks anyday;-) > > I have my own signed softcopy ;-) Could you email me a signed version;) > -- > Rob van der Heij rvdheij @ > gmail.com > > ---------------------------------------------------------------------- > For LINUX-390 subscribe / signoff / archive access > instructions, > send email to [EMAIL PROTECTED] with the > message: INFO LINUX-390 or visit > http://www.marist.edu/htbin/wlvindex?LINUX-390 > __________________________________ Do you Yahoo!? Yahoo! Mail Address AutoComplete - You start. We finish. http://promotions.yahoo.com/new_mail ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
