diff options
Diffstat (limited to 'results/classifier/accel-gemma3:12b/kvm/1686980')
| -rw-r--r-- | results/classifier/accel-gemma3:12b/kvm/1686980 | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/results/classifier/accel-gemma3:12b/kvm/1686980 b/results/classifier/accel-gemma3:12b/kvm/1686980 new file mode 100644 index 00000000..eb69fc5e --- /dev/null +++ b/results/classifier/accel-gemma3:12b/kvm/1686980 @@ -0,0 +1,30 @@ + +qemu is very slow when adding 16,384 virtio-scsi drives + +qemu runs very slowly when adding many virtio-scsi drives. I have attached a small reproducer shell script which demonstrates this. + +Using perf shows the following stack trace taking all the time: + + 72.42% 71.15% qemu-system-x86 qemu-system-x86_64 [.] drive_get + | + --72.32%--drive_get + | + --1.24%--__irqentry_text_start + | + --1.22%--smp_apic_timer_interrupt + | + --1.00%--local_apic_timer_interrupt + | + --1.00%--hrtimer_interrupt + | + --0.83%--__hrtimer_run_queues + | + --0.64%--tick_sched_timer + + 21.70% 21.34% qemu-system-x86 qemu-system-x86_64 [.] blk_legacy_dinfo + | + ---blk_legacy_dinfo + + 3.65% 3.59% qemu-system-x86 qemu-system-x86_64 [.] blk_next + | + ---blk_next \ No newline at end of file |