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    SubjectRe: Minutes from 10/1 LSE Call
    insecure wrote:
    > That sounds reasonable, but today's RAM throughput is on the order
    > of 1GB/s, not 100Mb/s. 'Out of L1' theory can't explain 100Mb/s ceiling
    > it seems.


    cp(1) data, at least, will never ever be in L1. Copying data you need
    to look at the ends of the pipeline -- hard drive throughput, PCI bus
    bandwidth, FSB bandwidth, speed at which ext2/3 allocates blocks, and
    similar things are likely bottlenecks.

    You'll never hit RAM bandwidth limits, unless your copies are extremely
    tiny, and entirely in L2 or pagecache.

    Jeff



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