enable TRIM by default ?

[Warner Losh]

> On Dec 3, 2014, at 1:34 AM, Peter Jeremy <peter at rulingia.com> wrote:
> 
> On 2014-Dec-03 00:45:47 -0700, Warner Losh <imp at bsdimp.com> wrote:
>> 
>>> On Dec 3, 2014, at 12:14 AM, Peter Jeremy <peter at rulingia.com> 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.
>> 
>> Is this a SSD, or a CF card of some flavor. The CFA ERASE trim method
>> pre-dates the much better and easier to use DSM (Data Set Trim) method
>> that more modern SSDs use. Perhaps we can take a cue off of that? Or
>> maybe the detection for when to use CFA ERASE is busted since it was
>> only ever supposed to be used with CF cards...
> 
> It's a Super Talent FEM16GF13M - which describes itself as a SSD and has
> a PATA interface.  That trial was ~3 years ago and so probably on 8.x.

Also just noticed this is the ad driver, not the ada driver. Is the above dmesg from
8.x?

Warner

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