linux-kernel - Re: [PATCH] dio: falling through to buffered I/O when invalidationof a page fails

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Date:	Mon, 17 Dec 2007 11:38:45 +0900
From:	Hisashi Hifumi <hifumi.hisashi@....ntt.co.jp>
To:	Zach Brown <zach.brown@...cle.com>,
	Badari Pulavarty <pbadari@...ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Chris Mason <chris.mason@...cle.com>
Subject: Re: [PATCH] dio: falling through to buffered I/O when
  invalidationof a page fails


At 04:15 07/12/15, Zach Brown wrote:
 >
 >> If anyone has a testcase - I can take a look at the problem again.
 >
 >I can try and throw something together..
 >
 >- z

I did a test by using fsstress.

I modified the dio write() of fsstress to check return value, and input
following command;

# fsstress -d /root/testdir/ -l 0 -n 1000 -p 1000 -z -f creat=1 -f write=1 
-f dwrite=1

I got EIO from dio write.


I encountered some PostgreSQL mailing list archive that mentioned about 
this issue.
http://groups.google.com/group/pgsql.hackers/browse_thread/thread/c7515ccd5ac1269c/dc2ddeac3fe0d8c1?lnk=raot&fwc=1

dio can be used in PostgreSQL to write transaction log(WAL). It is said 
that when dio is used,
EIO is returned under some workload.
  

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