Date: Fri, 2 Nov 2018 14:44:13 +0530 From: "Amartya, Shreyank" <shreyankfbsd@gmail.com> To: marius@freebsd.org Cc: freebsd-hackers@freebsd.org Subject: Re: Re: FW: eMMC AMD platform Message-ID: <a4a60049-3ff2-b7a0-9f3f-6f9f2fe8a050@gmail.com>
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Hi, So I was able to get the performance numbers up by increasing the default SDMA boundary value from 4k up to 512K (which is the default in linux). With the increased boundary size I saw an increase in HS200 (141 MB/s) as well as HS400 (193 MB/s) throughput as compared to earlier with both the modes (~105 MB/s). Going over the code I understand that an increase in size causes less DMA interrupts. Any specific reason to use 4K as default value? If not, is it okay to switch to 512K? Thanks Shreyank
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