On Wed, Feb 5, 2014 at 8:50 PM, Heikki Linnakangas
> On 02/05/2014 04:48 PM, Amit Kapila wrote:
>> I have done one test where there is a large suffix match, but
>> not large enough that it can compress more than 75% of string,
>> the CPU overhead with wal-update-prefix-suffix-encode-1.patch is
>> not much, but there is no I/O reduction as well.
> Hmm, it's supposed to compress if you save at least 25%, not 75%. Apparently
> I got that backwards in the patch...
So If I understand the code correctly, the new check should be
if (prefixlen + suffixlen < (slen * need_rate) / 100)
if (slen - prefixlen - suffixlen > (slen * need_rate) / 100)
Please confirm, else any validation for this might not be useful?
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