ZFS on top of GELI / Intel Atom 330 system

[Dan Naumov]

Pardon my ignorance, but what do these numbers mean and what
information is deductible from them?

- Dan Naumov



> I don't mean to take this off-topic wrt -stable but just
> for fun, I built a -current kernel with dtrace and did:
>
>        geli onetime gzero
>        ./hotkernel &
>        dd if=/dev/zero of=/dev/gzero.eli bs=1m count=1024
>        killall dtrace
>        geli detach gzero
>
> The hot spots:
> [snip stuff under 0.3%]
> kernel`g_eli_crypto_run                                    50   0.3%
> kernel`_mtx_assert                                         56   0.3%
> kernel`SHA256_Final                                        58   0.3%
> kernel`rijndael_encrypt                                    72   0.4%
> kernel`_mtx_unlock_flags                                   74   0.4%
> kernel`rijndael128_encrypt                                 74   0.4%
> kernel`copyout                                             92   0.5%
> kernel`_mtx_lock_flags                                     93   0.5%
> kernel`bzero                                              114   0.6%
> kernel`spinlock_exit                                      240   1.3%
> kernel`bcopy                                              325   1.7%
> kernel`sched_idletd                                       810   4.3%
> kernel`swcr_process                                      1126   6.0%
> kernel`SHA256_Transform                                  1178   6.3%
> kernel`rijndaelEncrypt                                   5574  29.7%
> kernel`acpi_cpu_c1                                       8383  44.6%
>
> I had to build crypto and geom_eli into the kernel to get proper
> symbols.
>
> References:
>  http://wiki.freebsd.org/DTrace
>  http://www.brendangregg.com/DTrace/hotkernel
>
> --Emil