Ubuntu
linux package

  1. Bug #620074
  2. Comment #616

Comment 616 for bug 620074

Revision history for this message
In , gatekeeper.mail (gatekeeper.mail-linux-kernel-bugs) wrote :

Alan, isn't what you just described named PIO? Isn't DMA the solution
that resolved high CPU load on storage IO? Isn't high CPU load on VM
IO (IOWAIT) very similar to PIO storage operation mode? Just to
remember my already asked question: is polling technique suitable for
VM IO as it was some years ago for NET IO?

> I/O wait isn't consuming CPU time but the process of reading/writing disks
> does
> consume CPU time because the process is doing work in the kernel managing the
> I/O and the things that go with it.
>