From: WGH <wgh@torlan.ru>
To: Borislav Petkov <bp@alien8.de>, Yazen Ghannam <yazen.ghannam@amd.com>
Cc: linux-edac@vger.kernel.org
Subject: Re: Unable to set (or read back) sdram_scrub_rate on amd64_edac F17h_M70h (Ryzen 3rd gen)
Date: Sun, 10 Jan 2021 14:46:52 +0300 [thread overview]
Message-ID: <a7e91287-cb0c-7d40-fa9c-c87d9692f229@torlan.ru> (raw)
In-Reply-To: <20210110113308.GB22211@zn.tnic>
On 1/10/21 2:33 PM, Borislav Petkov wrote:
> On Sun, Jan 10, 2021 at 09:03:24AM +0300, WGH wrote:
>> I tried many rates mentioned in scrubrates[] array, but the result is still the same.
>>
>> % echo 100000 | sudo tee /sys/devices/system/edac/mc/mc0/sdram_scrub_rate
>> 100000
>> % sudo cat /sys/devices/system/edac/mc/mc0/sdram_scrub_rate
>> 0
>>
>> dmesg excerpt:
>>
>> [ 0.561809] EDAC MC: Ver: 3.0.0
>> (skip)
>> [ 0.825762] EDAC amd64: F17h_M70h detected (node 0).
>> [ 0.826343] EDAC amd64: Node 0: DRAM ECC enabled.
>> [ 0.826901] EDAC amd64: MCT channel count: 2
>> [ 0.827512] EDAC MC0: Giving out device to module amd64_edac controller F17h_M70h: DEV 0000:00:18.3 (INTERRUPT)
>> [ 0.828106] EDAC MC: UMC0 chip selects:
>> [ 0.828106] EDAC amd64: MC: 0: 16384MB 1: 16384MB
>> [ 0.828690] EDAC amd64: MC: 2: 16384MB 3: 16384MB
>> [ 0.829262] EDAC MC: UMC1 chip selects:
>> [ 0.829262] EDAC amd64: MC: 0: 16384MB 1: 16384MB
>> [ 0.829829] EDAC amd64: MC: 2: 16384MB 3: 16384MB
>> [ 0.830383] EDAC amd64: using x16 syndromes.
>> [ 0.830992] EDAC PCI0: Giving out device to module amd64_edac controller EDAC PCI controller: DEV 0000:00:18.0 (POLLED)
>> [ 0.831577] AMD64 EDAC driver v3.5.0
>>
>> This is AMD Ryzen 9 3900XT on ASRock B550 Extreme4 motherboard, Linux 5.10.5.
> That thing checks a bit 0 in some PCI cfg reg on F17h before returning
> the scrubrate. Do as root:
>
> # setpci -s 00:18.6 0x0x48.l
% sudo setpci -s 00:18.6 0x48.l
b214bac4
% sudo setpci -s 00:18.6 0x48.l
b23225c4
% sudo setpci -s 00:18.6 0x48.l
b2648984
% sudo setpci -s 00:18.6 0x48.l
b27b9dc4
% sudo setpci -s 00:18.6 0x48.l
b293f504
Whatever that means.
>
> It could be that scrub rate setting is locked on your machine. Because
> it works here:
>
> # echo 100000 > /sys/devices/system/edac/mc/mc0/sdram_scrub_rate
> # cat /sys/devices/system/edac/mc/mc0/sdram_scrub_rate
> 390720
>
> That's a AMD Ryzen 7 2700X Eight-Core Processor, however.
>
> Yazen?
>
next prev parent reply other threads:[~2021-01-10 11:55 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-10 6:03 Unable to set (or read back) sdram_scrub_rate on amd64_edac F17h_M70h (Ryzen 3rd gen) WGH
2021-01-10 11:33 ` Borislav Petkov
2021-01-10 11:46 ` WGH [this message]
2021-01-10 12:00 ` Borislav Petkov
2021-01-11 20:16 ` Yazen Ghannam
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