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Date:      Sat, 28 Mar 2015 13:58:09 +0100 (CET)
From:      Wojciech Puchar <wojtek@puchar.net>
To:        Alexander Motin <mav@FreeBSD.org>
Cc:        freebsd-fs@FreeBSD.org, "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>
Subject:   Re: MAXBSIZE increase
Message-ID:  <alpine.BSF.2.20.1503281353580.809@laptop.wojtek.intra>
In-Reply-To: <5515C421.4040703@FreeBSD.org>
References:  <5515C421.4040703@FreeBSD.org>

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i routinely put
options         MAXPHYS=2097152

on my servers. no problems, except MUCH enhanced performance on large 
files. with UFS.

SOME SSDs (few) doesn't work properly with >1MB requests.

no idea about ZFS.

with NFS do not ever expect good performance with it's sync mode. if you 
like to take a risk add
vfs.nfsd.async=1

to sysctl.conf


unless your NFS clients depend on forced syncs, the risk is actually no 
higher that running normal UFS filesystem locally. And performance is 
excellent.




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