On Jan 9, 2010, at 2:02 PM, bank kus wrote: >> Probably not, but ZFS only runs in userspace on Linux >> with fuse so it >> will be quite different. > > I wasnt clear in my description, I m referring to ext4 on Linux. In fact on a > system with low RAM even the dd command makes the system horribly > unresponsive. > > IMHO not having fairshare or timeslicing between different processes issuing > reads is frankly unacceptable given a lame user can bring the system to a > halt with 3 large file copies. Are there ZFS settings or Project Resource > Control settings one can use to limit abuse from individual processes? > --
Are your sure this problem is related to ZFS? I have no problem with multiple threads reading and writing to my pools, it's till responsive, if I however put urandom with dd into the mix I get much more latency. Does't for example $(dd if=/dev/urandom of=/dev/null bs=1048576k count=8) give you the same problem, or if you use the file you already created from urandom as input to dd? Regards Henrik http://sparcv9.blogspot.com
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