Date: Fri, 29 May 2009 15:12:08 +0300 From: Dan Naumov <dan.naumov@gmail.com> To: Emil Mikulic <emikulic@gmail.com> Cc: Morgan Wesstr?m <freebsd-stable@pp.dyndns.biz>, freebsd-stable@freebsd.org Subject: Re: ZFS on top of GELI / Intel Atom 330 system Message-ID: <cf9b1ee00905290512y1d84241ej55b7405c32b95262@mail.gmail.com> In-Reply-To: <20090529112919.GA74359@dmr.ath.cx> References: <cf9b1ee00905290119w5eea0bfmd018d1c1282ac310@mail.gmail.com> <4A1FAB45.4040904@h3q.com> <cf9b1ee00905290312j2d1aeda8y3e4d8f4b1a0492f5@mail.gmail.com> <4A1FBD4A.5080204@pp.dyndns.biz> <20090529112919.GA74359@dmr.ath.cx>
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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
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