Re: [PATCH 14/17] bcache: back to cache all readahead I/Os

Jens Axboe
2020-01-23T18:31:50Z

On 1/23/20 10:27 AM, Coly Li wrote:
> On 2020/1/24 1:19 上午, Michael Lyle wrote:
>> Hi Coly and Jens--
>>
>> One concern I have with this is that it's going to wear out
>> limited-lifetime SSDs a -lot- faster. Was any thought given to making
>> this a tunable instead of just changing the behavior? Even if we have
>> an anecdote or two that it seems to have increased performance for
>> some workloads, I don't expect it will have increased performance in
>> general and it may even be costly for some workloads (it all comes
>> down to what is more useful in the cache-- somewhat-recently readahead
>> data, or the data that it is displacing).
>
> Hi Mike,
>
> Copied. This is good suggestion, I will do it after I back from Lunar
> New Year vacation, and submit it with other tested patches in following
> v5.6-rc versions.

Do you want me to just drop this patch for now from the series?

--
Jens Axboe