Physical vs effective write latency

By: Linus Torvalds (torvalds.delete@this.linux-foundation.org), September 11, 2008 11:39 am
Room: Moderated Discussions
Linus Torvalds (torvalds@linux-foundation.org) on 9/11/08 wrote:
> But as mentioned, for that to actually work, you
>also need to partition the commands-in-flight space by
>reads-vs-writes.

Last comment: I checked with some people who know, and
the fact is, the sucky SSD's apparently don't even support
NCQ anyway, so the drives wouldn't let you do reads
in the middle anyway.

So even if the OS tried, it couldn't do anything about it.
Once you send the drive a write command, that command may
randomly have a huge latency, and all subsequent commands
will too. The only thing you can basically do is to not
write to them,

The good SSD's (ie Intel) apparently do support
NCQ, but since they have latency under control anyway,
the main advantage of NCQ is better throughput by allowing
access optimizations rather than letting reads go before
writes.

So the discussion ends up being pretty theoretical. The
previous gen SSD's just aren't very good unless you have
a load that works for them (notably 99% reads).

Linus
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                                                                The File AbstractionMichael S2009/01/27 03:00 AM
                                                                The File AbstractionDean Kent2009/01/27 08:30 AM
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