Date: Tue, 7 Jan 2020 22:47:54 +0000 From: Rick Macklem <rmacklem@uoguelph.ca> To: Hans Petter Selasky <hps@selasky.org>, Wojciech Puchar <wojtek@puchar.net>, "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Subject: Re: maximum MAXBSIZE Message-ID: <YQBPR0101MB1427EEDE94AA6E34B49C3C09DD3F0@YQBPR0101MB1427.CANPRD01.PROD.OUTLOOK.COM> In-Reply-To: <d79078c4-f1cb-93b9-ee6e-f689936c1e01@selasky.org> References: <alpine.BSF.2.20.2001072210410.21107@puchar.net>, <d79078c4-f1cb-93b9-ee6e-f689936c1e01@selasky.org>
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Hans Petter Selasky wrote:=0A= >On 2020-01-07 22:12, Wojciech Puchar wrote:=0A= >> default MAXBSIZE is 128kB. badly low for todays magnetic disks.=0A= >>=0A= >> i have it set to 2MB on all computers that have magnetic disks. Great=0A= >> improvement with large files. especially when more than one are=0A= >> read/wrote in parallel. And no problems experienced=0A= >>=0A= >> But for optimal performance MAXBSIZE should be transfered in few times= =0A= >> longer than average seek time. todays disk do 200-250MB/s so 2MB is=0A= >> transfered below 10ms.=0A= >>=0A= >> 8-16MB seems like good choice. is there any reason not to set it that hi= gh?=0A= >=0A= >Old disk may not support it, especially USB 1.0/2.0 disks.=0A= I also thought it was limited to MAXPHYS, but maybe I'm only thinking of th= e NFS=0A= specific case?=0A= =0A= rick=0A=
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