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Date:      Fri, 10 Jan 2020 13:25:40 +0100 (CET)
From:      Wojciech Puchar <wojtek@puchar.net>
To:        Peter Jeremy <peter@rulingia.com>
Cc:        Gary Jennejohn <gljennjohn@gmail.com>, Hans Petter Selasky <hps@selasky.org>, Rick Macklem <rmacklem@uoguelph.ca>, Conrad Meyer <cem@freebsd.org>, "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>, Wojciech Puchar <wojtek@puchar.net>, Konstantin Belousov <kostikbel@gmail.com>
Subject:   Re: maximum MAXBSIZE
Message-ID:  <alpine.BSF.2.20.2001101325210.59407@puchar.net>
In-Reply-To: <20200109204943.GC25924@server.rulingia.com>
References:  <d79078c4-f1cb-93b9-ee6e-f689936c1e01@selasky.org> <YQBPR0101MB1427EEDE94AA6E34B49C3C09DD3F0@YQBPR0101MB1427.CANPRD01.PROD.OUTLOOK.COM> <20200108105136.0d54ebce@ernst.home> <alpine.BSF.2.20.2001081452360.44533@puchar.net> <20200108141810.GX23031@kib.kiev.ua> <CAG6CVpUrGyov12nQSKhofCPw5fAiXgDGChxf3-aFu1fKpirJTQ@mail.gmail.com> <alpine.BSF.2.20.2001091057420.96836@puchar.net> <CANCZdfokuE%2BKheFvSnx7M4he9Drx31xLj8o_GKUGJqKk32Oj7g@mail.gmail.com> <alpine.BSF.2.20.2001091520120.10661@puchar.net> <20200109164519.33fc7478@ernst.home> <20200109204943.GC25924@server.rulingia.com>

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>>> i think 4MB is OK for HDDs, more may be optimal for RAID5 arrays.
>>
>> POLA (principle of least amazement).  I certainly don't need a MAXPHYS set
>> to 4MB on my desktop machine.
>
> What are the downsides of running with MAXPHYS set to 4MB (or similar)?

For now i do not observe any.
I will post if i do.



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