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Date:      Wed, 23 Mar 2016 14:20:13 +0100 (CET)
From:      =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= <royger@FreeBSD.org>
To:        Julian Elischer <julian@freebsd.org>
Cc:        huanghwh <huanghwh@163.com>, freebsd-virtualization@freebsd.org
Subject:   Re: Poor disk performance of FreeBSD under AWS
Message-ID:  <alpine.OSX.2.20.1603231418260.753@mac>
In-Reply-To: <56EBDC2A.1020304@freebsd.org>
References:  <4a285458.9323.15388672651.Coremail.huanghwh@163.com> <91dc4bd.a112.15388868b7d.Coremail.huanghwh@163.com> <56EBDC2A.1020304@freebsd.org>

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On Fri, 18 Mar 2016, Julian Elischer wrote:
> On 18/03/2016 3:00 PM, huanghwh wrote:
> > BTW, with 1G ram configuration, vi can exit very quickly.
> > At 2016-03-18 14:26:14, "huanghwh" <huanghwh@163.com> wrote:
> > > I have a EC2 server in AWS, 4CPU+16G ram, FreeBSD 10.2R.
> > > 
> > > Use two command dd and vi:
> > > dd if=/dev/zero of=/.swap bs=1M count=8192 &
> > > 
> > > 8589934592 bytes transferred in 117.074462 secs (73371549 bytes/sec)
> > > 
> > > when dd run in background, input vi command  to edit a small txt file
> > > "d.txt" at same time,
> > > 
> > > and then write and quit immediately:
> > > 
> > > 
> > > /usr/bin/time vi d.txt
> > > 
> > > 
> > > 49.82 real 0.00 user 0.00 sys
> > > 
> > > in top command show:
> > > 810 root 1 23 0 12344K 2524K wswbuf 0 0:04 5.76% dd
> > > 821 root 1 20 0 23448K 4092K wdrain 0 0:00 0.00% vi
> > > 
> > > vi need almost 50 seconds to quit.
> I think some people are already looking at this.. it's not limited to AWS.

Is there a PR or Review about this? I don't have a 16GB system at hand, 
but it looks quite weird that it works "better" with 1GB rather than with 
16GB.

Are you using ZFS or UFS as your filesystem?

Roger.



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