Date: Wed, 22 Jun 2016 10:08:49 +0800 From: Jason Zhang <jasonzhang@cyphytech.com> To: Mark Felder <feld@FreeBSD.org> Cc: freebsd-stable@freebsd.org, freebsd-performance@freebsd.org, freebsd-hardware@freebsd.org Subject: Re: mfi driver performance too bad on LSI MegaRAID SAS 9260-8i Message-ID: <1790833A-9292-4A46-B43C-BF41C7C801BE@cyphytech.com> In-Reply-To: <1466527001.2694442.644278905.18E236CD@webmail.messagingengine.com> References: <16CD100A-3BD0-47BA-A91E-F445E5DF6DBC@cyphytech.com> <1466527001.2694442.644278905.18E236CD@webmail.messagingengine.com>
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Mark, Thanks We have same RAID setting both on FreeBSD and CentOS including cache = setting. In FreeBSD, I enabled the write cache but the performance is = the same. =20 We don=A1=AFt use ZFS or UFS, and test the performance on the RAW GEOM = disk =A1=B0mfidx=A1=B1 exported by mfi driver. We observed the = =A1=B0gstat=A1=B1 result and found that the write latency is too high. When we =A1=B0dd" the disk with 8k, it is lower than 1ms, = but it is 6ms on 64kb write. It seems that each single write operation = is very slow. But I don=A1=AFt know whether it is a driver problem or not. Jason > =D4=DA 2016=C4=EA6=D4=C222=C8=D5=A3=AC=C9=CF=CE=E712:36=A3=ACMark = Felder <feld@FreeBSD.org> =D0=B4=B5=C0=A3=BA >=20 >=20 >=20 > On Fri, Jun 17, 2016, at 02:17, Jason Zhang wrote: >> Hi, >>=20 >> I am working on storage service based on FreeBSD. I look forward to = a >> good result because many professional storage company use FreeBSD as = its >> OS. But I am disappointed with the Bad performance. I tested the = the >> performance of LSI MegaRAID 9260-8i and had the following bad result: >>=20 >> 1. Test environment: >> (1) OS: FreeBSD 10.0 release >=20 > 10.0-RELEASE is no longer supported. Can you test this on = 10.3-RELEASE? >=20 > Have you confirmed that both servers are using identical RAID = controller > settings? It's possible the CentOS install has enabled write caching = but > it's disabled on your FreeBSD server. Are you using UFS or ZFS on > FreeBSD? Do you have atime enabled? I believe CentOS is going to have > "relatime" or "nodiratime" by default to mitigate the write penalty on > each read access. >=20 > We need more data :-) >=20 >=20 > --=20 > Mark Felder > ports-secteam member > feld@FreeBSD.org
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