enable TRIM by default ?

[Alfred Perlstein]

On 12/2/14 11:14 PM, Peter Jeremy wrote:
> On 2014-Dec-02 07:43:13 +0000, Poul-Henning Kamp <phk at phk.freebsd.dk> wrote:
>> Isn't it time that we enable TRIM by default in newfs ?
> As an alternative viewpoint, I have a SSD that got severe indigestion when
> I tried to enable TRIM:
> aspire kernel: ad0: TIMEOUT - CFA ERASE retrying (1 retry left)
> aspire kernel: ad0: WARNING - SETFEATURES SET TRANSFER MODE taskqueue timeout - completing request directly
> aspire kernel: ata1: error issuing SETFEATURES ENABLE WCACHE command
> aspire kernel: ata1: error issuing SET_MULTI command
> aspire kernel: ata1: error issuing WRITE_DMA command
> The kernel then went to 1 core of interrupt and wedged.
>
> I admit that it's about 3 years old but smartctl says it's still got lots of
> life left in it and googling suggests they are still available.
>
> The problem is that if a SSD doesn't support TRIM, it is likely to have all
> sorts of misbehaviour if you attempt to enable TRIM.  If TRIM is enabled by
> default, you need to provide a simple way to disable it if the system can't
> cope.
>
Is there a hints/quirks system we can use?

So: default to on, quirks/hints sets to off?


-Alfred