[Bug 238733] kvm disk i/o extremely slow
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Date: Tue, 26 Jul 2022 10:51:15 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238733 --- Comment #5 from Alexander Shikov <a.shikov@itcons.net.ua> --- Hello! It seems I have the same issue with 13.1-RELEASE running as guest in Proxmox 6.4-15. vtblk0: <VirtIO Block Adapter> on virtio_pci1 vtblk0: 40960MB (83886080 512 byte sectors) # dd if=/dev/random of=test.dat bs=1M count=100 iflag=fullblock 100+0 records in 100+0 records out 104857600 bytes transferred in 14.858133 secs (7057253 bytes/sec) sysctl kern.timecounter.hardware HPET or TSC-low does not affect the issue. Linux Mint on the same host machine: # dd if=/dev/urandom of=test.dat bs=1M count=100 iflag=fullblock 100+0 records in 100+0 records out 104857600 bytes (105 MB, 100MiB) copied, 0,588288 s, 178 MB/s If switch VirtIO Block to SATA in VM configuration then speed changes to better: ada0 at ahcich0 bus 0 scbus2 target 0 lun 0 ada0: <QEMU HARDDISK 2.5+> ATA-7 SATA device ada0: Serial Number QM00005 ada0: 150.000MB/s transfers (SATA 1.x, UDMA5, PIO 8192bytes) ada0: Command Queueing enabled ada0: 40960MB (83886080 512 byte sectors) # dd if=/dev/random of=test.dat bs=1M count=100 iflag=fullblock 100+0 records in 100+0 records out 104857600 bytes transferred in 0.354972 secs (295396745 bytes/sec) -- You are receiving this mail because: You are the assignee for the bug.