| From: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
|---|---|
| To: | Josh Berkus <josh(at)agliodbs(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Proposal for 9.1: WAL streaming from WAL buffers |
| Date: | 2010-06-13 05:24:24 |
| Message-ID: | 4C146B88.8050305@enterprisedb.com |
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| Thread: | |
| 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
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