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Re: Proposal for 9.1: WAL streaming from WAL buffers

Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>

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From: Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>
To: Josh Berkus <josh@agliodbs.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>, Stefan Kaltenbrunner <stefan@kaltenbrunner.cc>, Fujii Masao <masao.fujii@gmail.com>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2010-06-13T05:24:24Z
Lists: pgsql-hackers 
On 12/06/10 01:16, Josh Berkus wrote:
>
>> Well, we're already not waiting for fsync, which is the slowest part.
>> If there's a performance problem, it may be because FADVISE_DONTNEED
>> disables kernel buffering so that we're forced to actually read the data
>> back from disk before sending it on down the wire.
>
> Well, that's fairly direct to solve, no?  Just disable FADVISE_DONTNEED
> if walsenders>  0.

We already do that.

-- 
   Heikki Linnakangas
   EnterpriseDB   http://www.enterprisedb.com