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: >On 2020-01-07 22:12, Wojciech Puchar wrote: >> default MAXBSIZE is 128kB. badly low for todays magnetic disks. >> >> i have it set to 2MB on all computers that have magnetic disks. Great >> improvement with large files. especially when more than one are >> read/wrote in parallel. And no problems experienced >> >> But for optimal performance MAXBSIZE should be transfered in few times >> longer than average seek time. todays disk do 200-250MB/s so 2MB is >> transfered below 10ms. >> >> 8-16MB seems like good choice. is there any reason not to set it that high? > >Old disk may not support it, especially USB 1.0/2.0 disks. I also thought it was limited to MAXPHYS, but maybe I'm only thinking of the NFS specific case? rick
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