Date: Thu, 24 Mar 2016 15:18:09 +0800 From: =?GB2312?B?u8bOxLvU?= <huanghwh@163.com> To: =?GB2312?Q?Roger_Pau_Monn=A8=A6?= <royger@FreeBSD.org> Cc: freebsd-virtualization@freebsd.org Subject: Re: Poor disk performance of FreeBSD under AWS Message-ID: <5C4F9BBA-5532-48A7-AEB1-64B83CFC2AA3@163.com> In-Reply-To: <alpine.OSX.2.20.1603231418260.753@mac> References: <4a285458.9323.15388672651.Coremail.huanghwh@163.com> <91dc4bd.a112.15388868b7d.Coremail.huanghwh@163.com> <56EBDC2A.1020304@freebsd.org> <alpine.OSX.2.20.1603231418260.753@mac>
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> 在 2016年3月23日，21:20，Roger Pau Monné <royger@FreeBSD.org> 写道： > >> 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. If you like, I can give you a server to try, the server is at ALiYun, not AWS, but same problem. > > Are you using ZFS or UFS as your filesystem? I am use UFS and ZFS > > Roger.
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