Marc Olzheim wrote: >On Thu, Jul 28, 2005 at 02:13:44PM -0700, Julian Elischer wrote: > > >>mount a large partition that has some room.. hopefully several times >>the space of all RAM. >>. >> >>do: >> >>dd if=/dev/zero of=/${mountpoint}/bigfile bs=128k count=1000000 & iostat 1 >> >> >>notice that dd dies with "not enough swapspace" after some number of >>seconds. >>(there is no swap attached). also notice that until the crash, IO speed >>was max for the >>disk. >> >>then add swap and do it again. >> >>notice that at teh point where dd previously crashed, the swap disk >>springs into life and disk IO on your main disk goes into the toilet. >>notice that dd gets swapped out. (!!!!) >> >>when the disk recovers enough, dd pages back in and creates more IO but >>in teh mean time there is no IO >>going on to the disk.. (watch the LEDs). >> >> > >Just to be clear, this happens on 5-STABLE, 6-STABLE and 7-CURRENT. > > it doesn't appear to hit 5.4. at least not for my small ATA based workstation. >Marc > >Received on Fri Jul 29 2005 - 17:40:33 UTC
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