Re: I/O Scheduler
Re: I/O Scheduler
- Subject: Re: I/O Scheduler
- From: Ken Hornstein <email@hidden>
- Date: Wed, 08 Aug 2012 09:07:49 -0400
>Maybe someone more knowledgeable can point out where in the VFS/UBC
>system the request combining happens - all I can say is I've certainly
>seen it in action from the requests it generates. There is also
>speculative read-ahead that causes I/O request sizes to grow
>exponentially when you read large files sequentially, which is
>presumably done in the same place. (you can easily observe this in
>action using dd and a filter scheme driver that logs requests)
I _think_ this happens in one of the cluster_* routines. I'd have to
check to be sure.
--Ken
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