Date: Sat, 31 Oct 2015 08:52:17 -0400 From: Adrian Chadd <adrian.chadd@gmail.com> To: Eugene Grosbein <eugen@grosbein.net> Cc: "freebsd-mips@freebsd.org" <freebsd-mips@freebsd.org> Subject: Re: CPU underload Message-ID: <CAJ-Vmok%2BgKXcpzpxNCBhxX8sYSh%2BQO7OaeojB4MCufO%2BA4zceg@mail.gmail.com> In-Reply-To: <56348239.3050701@grosbein.net> References: <56348063.3090508@grosbein.net> <56348239.3050701@grosbein.net>
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hi, there's a mips callchain kernel option. Sorry, I'm on my mac atm so I can't tell you. look in sys/conf/options for callchain, callgraph, etc. It's a build option. Just rebuild your kernel with that and check. I haven't tried with fastforward. What else are you doing? pf? ipfw? -adrian On 31 October 2015 at 04:56, Eugene Grosbein <eugen@grosbein.net> wrote: > On 31.10.2015 15:48, Eugene Grosbein wrote: >> Hi! >> >> I'm trying to get familiar with PMC and uncover reason of MIPS32 >> CPU being underloaded - about 50% - while performing traffic forwarding. >> >> It seems, kernel code abuses DELAY function as "pmcstat -S instructions -T" shows: > > [skip] > >> And why so heavy usage of _libmd_SHA256_Transf ? > > Well, it seems to be kern.random.harvest is guity for SHA256 abuse. > I've set sysctl kern.random.harvest.mask=0 and now it' gone: > > PMC: [INSTR_EXECUTED] Samples: 7490 (100.0%) , 0 unresolved > > %SAMP IMAGE FUNCTION CALLERS > 4.6 kernel ip_fastforward > 4.5 kernel memcpy > 4.4 kernel DELAY > 3.9 kernel arge_start_locked > 3.8 kernel _bus_dmamap_load_buf > 3.2 kernel ether_nh_input > 3.1 kernel if_inc_counter > 3.0 kernel arge_intr > 3.0 kernel ether_output > 2.9 kernel _bus_dmamap_sync > 2.6 kernel bzero > 2.6 kernel critical_enter > 2.4 kernel critical_exit > 2.3 kernel bus_dmamap_sync_buf > 2.2 kernel _rw_runlock_cookie > 2.1 kernel rn_match > 1.9 kernel __rw_rlock > 1.7 kernel netisr_dispatch_src > 1.5 kernel spinlock_exit > 1.5 kernel uma_zalloc_arg > 1.5 kernel generic_bs_barrier > 1.4 kernel _bus_dmamap_load_mbu > 1.4 kernel arge_newbuf > 1.4 kernel _rm_rlock > 1.4 kernel m_adj > 1.4 libpmc.so. pmclog_read > 1.4 kernel mipsNN_pdcache_wb_ra > 1.4 kernel arpresolve > 1.3 kernel bcmp > 1.3 kernel ether_demux > 1.3 kernel mipsNN_pdcache_inv_r > 1.3 kernel _bus_dmamap_unload > 1.2 kernel uma_zfree_arg > 1.2 kernel if_transmit > 1.2 kernel bus_dmamap_load_mbuf > 1.1 kernel _rm_runlock > 1.0 kernel rtfree > CONVERSION STATISTICS:oc1_fib > #exec/elf 1 > #samples/total 102761 > #samples/unknown-function 2939 > #callchain/dubious-frames 23 > > Still too many of DELAYs. > > _______________________________________________ > freebsd-mips@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-mips > To unsubscribe, send any mail to "freebsd-mips-unsubscribe@freebsd.org"
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