| From: | Michael Adler <adler(at)pobox(dot)com> |
|---|---|
| To: | "E(dot)Rodichev" <er(at)sai(dot)msu(dot)su> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: |
| Date: | 2005-02-15 18:05:18 |
| Message-ID: | 20050215180518.GA25873@pobox.com |
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| Lists: | pgsql-hackers |
On Tue, Feb 15, 2005 at 08:03:39PM +0300, E.Rodichev wrote:
> On Tue, 15 Feb 2005, Magnus Hagander wrote:
> >Question 1: Is your writeback cache really disabled in Linux, on the
> >harddrive? Windows fsync will *write through the disk write cache* if
> >the driver is properly implemented. AFAIK, on Linux if write cache is
> >enabled on the drive, fsync will only get into the cache.
>
> Difficult to say concerning writeback cache... I have 2.6.10 without any
> additional tuning, file system is ext2. From dmesg:
>
> hda: TOSHIBA MK8026GAX, ATA DISK drive
> hda: max request size: 128KiB
> hda: 156301488 sectors (80026 MB), CHS=65535/16/63, UDMA(100)
> hda: cache flushes supported
Write caching is generally on by default with IDE drives. Disable it
like so:
hdparm -W 0 /dev/hda
-Mike Adler
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