Jens Axboe wrote:
The only problem with SSD's is the people who designed the ATA TRIM
command requires us to completely drian the I/O queue before issuing
it. Because of this incompetence, we need to be a bit more careful
about how we issue them.
And this bit that I wasn't aware of. Such a requirement in the standard
is a trainwreck indeed.
Precisely, but that's how basically anything works with SATA NCQ, only
read/write dma commands may be queued. Anything else requires an idle
drive before issue.
Very true -- but FWIW, one option being considered at T13 is having a
queue-able TRIM.
Jeff
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