Messages in this thread | | | Date | Sat, 4 Oct 2003 22:38:38 -0700 | From | Andrew Morton <> | Subject | Re: Minutes from 10/1 LSE Call |
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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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