<alyssa>
marcan: In a profile i'm looking at, 7% of agx_submit_batch is spent in mbox
<alyssa>
mbox_send_message
<alyssa>
mostly preempt_count_sub inside of the spin_unlock_irqrestore
* alyssa
<3 the whole system profiling that lets me follow calls into the kernel
<marcan>
alyssa: lol. I think we still need a spinlock for submission, but not like the 4 or whatever mailbox manages to use. also, might be able to play games with atomics to avoid the spinlock in the uncontended case.
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