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Re: ext4 finally doing the right thing

From: Pierre Frédéric Caillaud <lists(at)peufeu(dot)com>
To: pgsql-performance(at)postgresql(dot)org
Subject: Re: ext4 finally doing the right thing
Date: 2010-01-21 16:36:47
Message-ID: op.u6v5rlilcke6l8@soyouz (view raw or flat)
Thread:
Lists: pgsql-performance
> Now, with ext4 moving to full barrier/fsync support, we could get to the
> point where WAL in the main data FS can mimic the state where WAL is
> seperate, namely that WAL writes can "jump the queue" and be written
> without waiting for the data pages to be flushed down to disk, but also
> that you'll get the big backlog of data pages to flush when
> the first fsyncs on big data files start coming from checkpoints...

	Does postgres write something to the logfile whenever a fsync() takes a  
suspiciously long amount of time ?

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