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    SubjectRe: Linux Kernel Dump Summit 2005
    Hi!

    > > CMD | NET TIME (in seconds) | OUTPUT SIZE (in bytes)
    > > ---------+--------------------------------+------------------------
    > > cp | 35.94 (usr 0.23, sys 14.16) | 2,121,438,352 (100.0%)
    > > lzf | 54.30 (usr 35.04, sys 13.10) | 1,959,473,330 ( 92.3%)
    > > gzip -1 | 200.36 (usr 186.84, sys 11.73) | 1,938,686,487 ( 91.3%)
    > > ---------+--------------------------------+------------------------
    > >
    > > Although it is too early to say lzf's compress ratio is good
    > > enough, its compression speed is impressive indeed.
    >
    > As you say, the speed of lzf relative to gzip is impressive.
    >
    > However if the properties of the kernel dump mean that it is not suitable for
    > compression then surely it is not efficient to spend any time on it.
    >
    > >And the
    > > result also suggests that it is too early to give up the idea of
    > > full dump with compression.
    >
    > Are you sure? :-)
    > If we are talking about systems with 32GB of memory then we must be taking
    > about organisations who can afford an extra 100GB of disk space just for
    > keeping their kernel dump files.
    >
    > I would expect that speed of recovery would always be the primary concern.
    > Would you agree?

    Notice that suspend2 project actually introduced compression *for
    speed*. Doing it right means that it is faster to do it
    compressed. See Jamie Lokier's description how to *never* slow down.

    Pavel
    --
    if you have sharp zaurus hardware you don't need... you know my address
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