Pavel Machek wrote:
On Fri 17-03-06 12:25:44, Jeff Garzik wrote:
I have two routers, ADM5120-based Edimax and LinkSys
WRT54G v5, both of which have a mere 2MB of flash, and
both use SquashFS to maximize that space. And both are
el cheapo, slow embedded processors that run far slower
than 300Mhz. I look askance at anyone who wants to make
an arbitrary filesystem design decision imposing tons of
bytesex upon these lowly devices.
gzip is already pretty expensive, I'd say. Is not byteswap lost in
noise?
Perhaps, but almost all the byteswap is performed on the metadata side,
reading directories and inodes, where nearly every byte will need to be
swapped. As inodes are compacted and compressed in 8 KB blocks, and are
on average 15 bytes in size, for each 8 KB decompress you're potentially
doing 8192/15 inode byteswaps. This is probably sufficent to affect
directory search and lookup on a slow processor.
The data path is all gzip overhead (64K datablocks), there is no
byteswap taking place except for the block size integer. Therefore
byteswap doesn't have any affect on reading data.
Phillip
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