[Kernel-packages] [Bug 1815178] Re: 18.04: Raid performances on kernel 4.15 and newer are suboptimal when used on NVMe devices
This bug has been dormant for a while with no update. I'm marking it as won't fix. If this is still and issue, please re-open this bug. ** Changed in: linux (Ubuntu) Status: Incomplete => Won't Fix -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1815178 Title: 18.04: Raid performances on kernel 4.15 and newer are suboptimal when used on NVMe devices Status in linux package in Ubuntu: Won't Fix Bug description: Hello, We have been running multiple tests using the md driver to build various type of RAID devices. Performances on RAID5 are particularly disappointing so we would like to know if there are any known issue with the md driver on Bionic kernels. Here are some of our results : Test (Threads)QCT JBODQCT RAID5 (8 threads) QCT RAID10 read(1) 838751 (-10%) 572 (-32%) read(2) 1226 1172 (-4%) 1057 (-14%) read(4) 1129 2006 (+78%) 1760 (+56%) write(1) 804382 (-52%) 398 (-50%) write(2) 1047 175 (-83%) 667 (-36%) write(4) 883415 (-53%) 871 (-1%) randread(1) 863749 (-13%) 619 (-28%) randread(2) 1346 1067 (-21%) 1020 (-24%) randread(4) 1648 1785 (+8%) 1650 (=) randwrite(1) 766287 (-63%) 391 (-50%) randwrite(2) 1044 313 (-70%) 664 (-36%) randwrite(4) 916282 (-69%) 885 (-3%) We are preparing tests with one of the latest mainline kernel. TIA, ...Louis To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1815178/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1815178] Re: 18.04: Raid performances on kernel 4.15 and newer are suboptimal when used on NVMe devices
Hi, this bug has not been replied to for a while. I will mark it closed next week if it has not been updated. ** Changed in: linux (Ubuntu) Importance: Medium => Low -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1815178 Title: 18.04: Raid performances on kernel 4.15 and newer are suboptimal when used on NVMe devices Status in linux package in Ubuntu: Incomplete Bug description: Hello, We have been running multiple tests using the md driver to build various type of RAID devices. Performances on RAID5 are particularly disappointing so we would like to know if there are any known issue with the md driver on Bionic kernels. Here are some of our results : Test (Threads)QCT JBODQCT RAID5 (8 threads) QCT RAID10 read(1) 838751 (-10%) 572 (-32%) read(2) 1226 1172 (-4%) 1057 (-14%) read(4) 1129 2006 (+78%) 1760 (+56%) write(1) 804382 (-52%) 398 (-50%) write(2) 1047 175 (-83%) 667 (-36%) write(4) 883415 (-53%) 871 (-1%) randread(1) 863749 (-13%) 619 (-28%) randread(2) 1346 1067 (-21%) 1020 (-24%) randread(4) 1648 1785 (+8%) 1650 (=) randwrite(1) 766287 (-63%) 391 (-50%) randwrite(2) 1044 313 (-70%) 664 (-36%) randwrite(4) 916282 (-69%) 885 (-3%) We are preparing tests with one of the latest mainline kernel. TIA, ...Louis To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1815178/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1815178] Re: 18.04: Raid performances on kernel 4.15 and newer are suboptimal when used on NVMe devices
** Changed in: linux (Ubuntu) Status: In Progress => Incomplete -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1815178 Title: 18.04: Raid performances on kernel 4.15 and newer are suboptimal when used on NVMe devices Status in linux package in Ubuntu: Incomplete Bug description: Hello, We have been running multiple tests using the md driver to build various type of RAID devices. Performances on RAID5 are particularly disappointing so we would like to know if there are any known issue with the md driver on Bionic kernels. Here are some of our results : Test (Threads)QCT JBODQCT RAID5 (8 threads) QCT RAID10 read(1) 838751 (-10%) 572 (-32%) read(2) 1226 1172 (-4%) 1057 (-14%) read(4) 1129 2006 (+78%) 1760 (+56%) write(1) 804382 (-52%) 398 (-50%) write(2) 1047 175 (-83%) 667 (-36%) write(4) 883415 (-53%) 871 (-1%) randread(1) 863749 (-13%) 619 (-28%) randread(2) 1346 1067 (-21%) 1020 (-24%) randread(4) 1648 1785 (+8%) 1650 (=) randwrite(1) 766287 (-63%) 391 (-50%) randwrite(2) 1044 313 (-70%) 664 (-36%) randwrite(4) 916282 (-69%) 885 (-3%) We are preparing tests with one of the latest mainline kernel. TIA, ...Louis To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1815178/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1815178] Re: 18.04: Raid performances on kernel 4.15 and newer are suboptimal when used on NVMe devices
Hi Louis, can you provide some information about the physical devices and also the benchmark tool you are using for the benchmarking? Thanks ** Changed in: linux (Ubuntu) Assignee: (unassigned) => Colin Ian King (colin-king) ** Changed in: linux (Ubuntu) Status: Confirmed => In Progress ** Changed in: linux (Ubuntu) Importance: Undecided => Medium -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1815178 Title: 18.04: Raid performances on kernel 4.15 and newer are suboptimal when used on NVMe devices Status in linux package in Ubuntu: In Progress Bug description: Hello, We have been running multiple tests using the md driver to build various type of RAID devices. Performances on RAID5 are particularly disappointing so we would like to know if there are any known issue with the md driver on Bionic kernels. Here are some of our results : Test (Threads)QCT JBODQCT RAID5 (8 threads) QCT RAID10 read(1) 838751 (-10%) 572 (-32%) read(2) 1226 1172 (-4%) 1057 (-14%) read(4) 1129 2006 (+78%) 1760 (+56%) write(1) 804382 (-52%) 398 (-50%) write(2) 1047 175 (-83%) 667 (-36%) write(4) 883415 (-53%) 871 (-1%) randread(1) 863749 (-13%) 619 (-28%) randread(2) 1346 1067 (-21%) 1020 (-24%) randread(4) 1648 1785 (+8%) 1650 (=) randwrite(1) 766287 (-63%) 391 (-50%) randwrite(2) 1044 313 (-70%) 664 (-36%) randwrite(4) 916282 (-69%) 885 (-3%) We are preparing tests with one of the latest mainline kernel. TIA, ...Louis To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1815178/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1815178] Re: 18.04: Raid performances on kernel 4.15 and newer are suboptimal when used on NVMe devices
** Summary changed: - 18.04: Raid5 performances on kernel 4.15 are suboptimal + 18.04: Raid performances on kernel 4.15 and newer are suboptimal when used on NVMe devices -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1815178 Title: 18.04: Raid performances on kernel 4.15 and newer are suboptimal when used on NVMe devices Status in linux package in Ubuntu: Confirmed Bug description: Hello, We have been running multiple tests using the md driver to build various type of RAID devices. Performances on RAID5 are particularly disappointing so we would like to know if there are any known issue with the md driver on Bionic kernels. Here are some of our results : Test (Threads)QCT JBODQCT RAID5 (8 threads) QCT RAID10 read(1) 838751 (-10%) 572 (-32%) read(2) 1226 1172 (-4%) 1057 (-14%) read(4) 1129 2006 (+78%) 1760 (+56%) write(1) 804382 (-52%) 398 (-50%) write(2) 1047 175 (-83%) 667 (-36%) write(4) 883415 (-53%) 871 (-1%) randread(1) 863749 (-13%) 619 (-28%) randread(2) 1346 1067 (-21%) 1020 (-24%) randread(4) 1648 1785 (+8%) 1650 (=) randwrite(1) 766287 (-63%) 391 (-50%) randwrite(2) 1044 313 (-70%) 664 (-36%) randwrite(4) 916282 (-69%) 885 (-3%) We are preparing tests with one of the latest mainline kernel. TIA, ...Louis To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1815178/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
