Is this faster nowadays if you use the new -blockdev parameter instead
of -drive?
** Changed in: qemu
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1686980
Title:
qemu is very slow when adding 16,384 virtio-scsi drives
Status in QEMU:
Incomplete
Bug description:
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
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--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
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