Re: ZFS on top of GELI / Intel Atom 330 system

On Fri, May 29, 2009 at 12:47:38PM +0200, Morgan Wesstr?m wrote:
> You can benchmark the encryption subsytem only, like this:
>
> # kldload geom_zero
> # geli onetime -s 4096 -l 256 gzero
> # sysctl kern.geom.zero.clear=0
> # dd if=/dev/gzero.eli of=/dev/null bs=1M count=512
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
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