enable TRIM by default ?

[Warner Losh]

> On Dec 3, 2014, at 12:19 AM, Alfred Perlstein <alfred at freebsd.org> wrote:
> 
> 
> 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?

IMO, CFA ERASE is a big clue something is amiss for anything that isn’t
a bona-fide CF card.

Warner

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