Date: Tue, 7 Jan 2020 22:23:54 +0100 From: Hans Petter Selasky <hps@selasky.org> To: Wojciech Puchar <wojtek@puchar.net>, freebsd-hackers@freebsd.org Subject: Re: maximum MAXBSIZE Message-ID: <d79078c4-f1cb-93b9-ee6e-f689936c1e01@selasky.org> In-Reply-To: <alpine.BSF.2.20.2001072210410.21107@puchar.net> References: <alpine.BSF.2.20.2001072210410.21107@puchar.net>
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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. --HPS
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