Bug#1020765: Does Debian 11.x 32 bit support NVDIMM?
Control: severity -1 normal Control: tags -1 +moreinfo On Tue, Oct 04, 2022 at 05:57:12PM +, Williams, Dan J wrote: > On Mon, 26 Sep 2022 08:26:56 + Winnie Yue wrote: > > Package: ndctl > > Version: 71.1-1 > > Severity: serious > > For Debian 11.5 32 bit, I got below info: > > But I found that Debian 11.5 32 bit vm couldn’t recognize the NVDIMM device: > > # dmesg | grep -i bios-e820 | grep persistent > > [ 0.00] BIOS-e820: [mem 0x00024000-0x00043fff] > > persistent (type 7) > > Note that this is not sufficient for advertising NVDIMM resources. A > Type-7 memory range still requires an ACPI NFIT to advertise the memory > range. Thanks Dan for this bit, I've missed it. Winnie: please try passing the proper ACPI data; your email address suggests that your VM is one I don't know how to operate. > That said, why are you trying to run a 32-bit environment. If you need a > 32-bit userspace you can still use a 64-bit kernel. 32-bit x86 is not > well looked after by the kernel community in general these days. That's another point; time spent validating a 32-bit kernel isn't that useful. I was really shocked it can use NVDIMM at all. In the userland, you can't count on the stack other than the very lowest level (ie, ndctl). Meow! -- ⢀⣴⠾⠻⢶⣦⠀ ⣾⠁⢠⠒⠀⣿⡁ It's time to migrate your Imaginary Protocol from version 4i to 6i. ⢿⡄⠘⠷⠚⠋⠀ ⠈⠳⣄
Bug#1020765: Does Debian 11.x 32 bit support NVDIMM?
Comments inline below On Mon, 26 Sep 2022 08:26:56 + Winnie Yue wrote: > Package: ndctl > Version: 71.1-1 > Severity: serious > > For Debian 11.5 32 bit, I got below info: > > apt-cache search ndctl > > libndctl-dev - Development files for libndctl > > libndctl6 - Utility library for managing the libnvdimm subsystem > > ndctl - Utility for managing the nvdimm subsystem > > It is same to what I got from Debian 11.5 64 bit: > > apt-cache search ndctl > > libndctl-dev - Development files for libndctl > > libndctl6 - Utility library for managing the libnvdimm subsystem > > ndctl - Utility for managing the nvdimm subsystem > > > From https://lists.debian.org/debian-devel/2016/12/msg00330.html, > https://lists.debian.org/debian-devel/2016/12/msg00343.html, NVDIMM will be > fully supported once OS has the package ndctl. > > But I found that Debian 11.5 32 bit vm couldn’t recognize the NVDIMM device: > > > #cat /etc/debian_version > > 11.5 > > > > #uname -m > > i686 > > > > # dmesg | grep -i bios-e820 | grep persistent > > [ 0.00] BIOS-e820: [mem 0x00024000-0x00043fff] persistent > (type 7) Note that this is not sufficient for advertising NVDIMM resources. A Type-7 memory range still requires an ACPI NFIT to advertise the memory range. That said, why are you trying to run a 32-bit environment. If you need a 32-bit userspace you can still use a 64-bit kernel. 32-bit x86 is not well looked after by the kernel community in general these days.
Bug#1020765: Does Debian 11.x 32 bit support NVDIMM?
Package: ndctl Version: 71.1-1 Severity: serious For Debian 11.5 32 bit, I got below info: apt-cache search ndctl libndctl-dev - Development files for libndctl libndctl6 - Utility library for managing the libnvdimm subsystem ndctl - Utility for managing the nvdimm subsystem It is same to what I got from Debian 11.5 64 bit: apt-cache search ndctl libndctl-dev - Development files for libndctl libndctl6 - Utility library for managing the libnvdimm subsystem ndctl - Utility for managing the nvdimm subsystem >From https://lists.debian.org/debian-devel/2016/12/msg00330.html, >https://lists.debian.org/debian-devel/2016/12/msg00343.html, NVDIMM will be >fully supported once OS has the package ndctl. But I found that Debian 11.5 32 bit vm couldn’t recognize the NVDIMM device: #cat /etc/debian_version 11.5 #uname -m i686 # dmesg | grep -i bios-e820 | grep persistent [0.00] BIOS-e820: [mem 0x00024000-0x00043fff] persistent (type 7) # lsmod | grep -i pmem # lsmod | grep -i nvdimm The NVDIMM device has been added to Debian 11.5 32bit VM, and it appears in BIOS-e820 table, but no NVDIMM modules were loaded and no PMem device is listed For Debian 11.5 64 bit vm, I got below info: # cat /etc/debian_version 11.5 # uname -m x86_64 #dmesg | grep -i bios-e820 | grep persistent [0.00] BIOS-e820: [mem 0x00024000-0x00043fff] persistent (type 7) # lsmod | grep -i pmem dax_pmem_compat16384 0 device_dax 20480 1 dax_pmem_compat nd_pmem24576 0 dax_pmem_core 16384 1 dax_pmem_compat nd_btt 28672 1 nd_pmem libnvdimm 200704 5 dax_pmem_core,nd_btt,nd_pmem,dax_pmem_compat,nfit # lsmod | grep -i nvdimm libnvdimm 200704 5 dax_pmem_core,nd_btt,nd_pmem,dax_pmem_compat,nfit So I’d like to confirm whether Debian 11.x 32 bit support NVDIMM or not. Your reply would be appreciated. Best regards, Winnie Yue
