Date: Fri, 29 May 2009 21:29:19 +1000 From: Emil Mikulic <emikulic@gmail.com> To: Morgan Wesstr?m <freebsd-stable@pp.dyndns.biz> Cc: freebsd-stable@freebsd.org Subject: Re: ZFS on top of GELI / Intel Atom 330 system Message-ID: <20090529112919.GA74359@dmr.ath.cx> In-Reply-To: <4A1FBD4A.5080204@pp.dyndns.biz> References: <cf9b1ee00905290119w5eea0bfmd018d1c1282ac310@mail.gmail.com> <4A1FAB45.4040904@h3q.com> <cf9b1ee00905290312j2d1aeda8y3e4d8f4b1a0492f5@mail.gmail.com> <4A1FBD4A.5080204@pp.dyndns.biz>
next in thread | previous in thread | raw e-mail | index | archive | help
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
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20090529112919.GA74359>