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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