[plug] dd speed estimates and /dev/hdx grepping

Cameron Patrick cameron at patrick.wattle.id.au
Wed Oct 22 20:10:25 WST 2003


On Wed, Oct 22, 2003 at 08:00:24PM +0800, Derek Fountain wrote:

| At the default of 512 bytes, each sector takes a number of reads and
| writes to complete. Not terribly efficient. 

Really?  Craig said something along those lines too, but I'd've thought
that the kernel would be clever enough to lump all the reads and writes
together when it actually talks to the hardware.

| Mine were on the same IDE channel which made things a lot worse for
| me.

Yeah, that can kill performance.

Cameron.

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