Messages in this thread | | | Date | Sun, 13 Feb 2000 17:39:19 -0500 | From | Giuliano Pochini <> | Subject | Re: elevator-starvation-4 (2.2.14 && 2.3.42) |
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> Well, yes and no. I guess my fundamental claim is that if > userland is able to generate requests faster than the driver can > fulfill them for an extended period of time then we've got a larger > problem than worrying about a particular request taking a long time > to satisfy. Indeed, I claim that as long as the driver cannot keep up > there will always be a pathological case where a particular request > is unreasonably delayed.
Yes, it is, but when several processes are reading/writing large amounts of data at the same time, the kernel should manage requests so that all processes gets a balanced IO rate. The way 2.2.14 behaves is wrong IMHO, because one of the N running processes have to wait until one the of others finishes its work. IO time should be given to requests like CPU time is shared between processes. Can I call it "preemptive I/O" ? :-))
Bye.
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