https://bugzilla.kernel.org/show_bug.cgi?id=216430 Bug ID: 216430 Summary: mdtest may pause for 5-10 mins on ext4 Product: File System Version: 2.5 Kernel Version: 5.10 Hardware: AMD OS: Linux Tree: Mainline Status: NEW Severity: blocking Priority: P1 Component: ext4 Assignee: fs_ext4@xxxxxxxxxxxxxxxxxxxx Reporter: sunjunchao2870@xxxxxxxxx Regression: No Created attachment 301705 --> https://bugzilla.kernel.org/attachment.cgi?id=301705&action=edit mdtest may pause for 5-10 mins on ext4 Hi, all. Recenlty we ran mdtest on ext4, and observed a wired phenomenon: After ran some mdtest cases, mdtest will pause for 5-10mins, this impacts performance of ext4 severely. And we can not repro this on xfs. Some information about machine: [root@client2 mnt_ramdisk2]# lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 128 On-line CPU(s) list: 0-127 Thread(s) per core: 2 Core(s) per socket: 32 Socket(s): 2 NUMA node(s): 2 Vendor ID: AuthenticAMD CPU family: 25 Model: 1 Model name: AMD EPYC 7543 32-Core Processor Stepping: 1 CPU MHz: 1799.746 CPU max MHz: 3737.8899 CPU min MHz: 1500.0000 BogoMIPS: 5599.80 Virtualization: AMD-V L1d cache: 32K L1i cache: 32K L2 cache: 512K L3 cache: 32768K NUMA node0 CPU(s): 0-31,64-95 NUMA node1 CPU(s): 32-63,96-127 Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf pni pclmulqdq monitor ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb cat_l3 cdp_l3 invpcid_single hw_pstate sme ssbd mba sev ibrs ibpb stibp vmmcall sev_es fsgsbase bmi1 avx2 smep bmi2 invpcid cqm rdt_a rdseed adx smap clflushopt clwb sha_ni xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local clzero irperf xsaveerptr rdpru wbnoinvd amd_ppin arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold v_vmsave_vmload vgif umip pku ospke vaes vpclmulqdq rdpid overflow_recov succor smca [root@client2 ~]# uname -r 5.10.139-default We could also reproduced with 5.3.18 and 5.15. We could reproduced this by running: modprobe brd rd_nr=1 rd_size=167772160 max_part=0 /opt/tools/e2fsprogs/mkfs.ext4 -i 2048 -I 1024 -J size=20000 -Odir_index,large_dir,filetype /dev/ram0 echo `blkid /dev/ram0 |awk '{print $2}'` /mnt_ramdisk3 ext4 defaults,noatime,nodiratime,user_xattr,nofail,x-systemd.device-timeout=5 0 0 >> /etc/fstab mount -a for ((i=1;i<=100;i++)) ; do (time /usr/local/bin/mdtest -R -C -L -F -u -z 10 -b 2 -I 1000 -u -d /mnt_ramdisk3/mdtest-$RANDOM) 2>&1 |grep -E " at |real" ; done which mnt_ramdisk3 is mounted a ext4 file system with ram or nvme disk. This problem occured one time per 100 mdtest cases almostly. The test result is attched. Any thoughts or hints about this? Let me known if any information is required. Thanks! Kind regards, JunChao -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
