From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Lelsie Rhorer" Subject: RE: Date: Sun, 5 Apr 2009 00:05:17 -0500 Message-ID: <20090405050520.KWXV19140.cdptpa-omta03.mail.rr.com@Leslie> References: <87f94c370904041738g4ef6221co6c3ace1ebf51dcdf@mail.gmail.com> Reply-To: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <87f94c370904041738g4ef6221co6c3ace1ebf51dcdf@mail.gmail.com> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids > Alternate theory - serious fsync performance issue > > I don't know if it's related, but there is a lot of recent discussion > related to fsync causing large delays in ext3. Linus is saying his > highspeed SDD is seeing multisecond delays. He is very frustrated > because the SDD should be more or less instantaneous. > > The current thread is http://markmail.org/message/adiyz3lri6tlueaf > > In one of the other threads I saw someone saying that in one test they > had a fsync() call take minutes to return. Apparently no one yet > fully understands what is going on. Seems like something that could > in some way be related to what you are seeing. Well, it could be. I tried flushing the cashes numerous times while testing, but I never could see it made a difference one way or the other.