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SubjectRe: Minutes from 10/1 LSE Call
insecure <insecure@mail.od.ua> wrote:
>
> So:
> * we hit a ceiling of ~133 Mb/s, no matter how many disks
> * CPU utilization is 100%, spent mostly in copy_to_user
> * RAM bandwidth is >1Gb/s
>
> These can't be true at once.

True. But bear in mind that the data crosses the memory busses up to three
times: disk to pagecache, pagecache to CPU, CPU to user memory.

So top speed may be as little as 300 MB/sec.


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