Might want to look at metalog, it does delayed writes, though ultimately
your issue is io bound and there's not much you can do to reduce io if
you want to keep syslog logging your pgsql queries and such.
Tom Lane wrote:
>Greg Spiegelberg <gspiegelberg@cranel.com> writes:
>
>
>>I turned syslog back on and the restore slowed down again. Turned
>>it off and it sped right back up.
>>
>>
>
>We have heard reports before of syslog being quite slow. What platform
>are you on exactly? Does Richard's suggestion of turning off syslog's
>fsync help?
>
> regards, tom lane
>
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