Date: Sat, 31 Oct 2015 15:48:35 +0700 From: Eugene Grosbein <eugen@grosbein.net> To: freebsd-mips@freebsd.org Subject: CPU underload Message-ID: <56348063.3090508@grosbein.net>
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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: %SAMP IMAGE FUNCTION CALLERS 6.3 kernel spinlock_exit 5.3 kernel ip_fastforward 4.4 kernel memcpy 4.2 kernel _libmd_SHA256_Transf 3.3 kernel _bus_dmamap_load_buf 3.3 kernel DELAY 3.3 kernel arge_start_locked 3.1 kernel bzero 3.0 kernel arge_intr 2.8 kernel _bus_dmamap_sync 2.8 kernel ether_nh_input 2.6 kernel ether_output 2.5 kernel if_inc_counter 2.3 kernel critical_enter 2.2 kernel bus_dmamap_sync_buf 2.0 kernel critical_exit 1.8 kernel _rw_runlock_cookie 1.7 kernel __rw_rlock 1.6 kernel rn_match 1.5 kernel mipsNN_pdcache_inv_r 1.5 kernel _rm_rlock 1.4 kernel _bus_dmamap_load_mbu 1.4 kernel m_adj 1.3 kernel arge_newbuf 1.3 kernel mipsNN_pdcache_wb_ra 1.3 kernel bcmp 1.2 kernel _bus_dmamap_unload 1.2 kernel uma_zfree_arg 1.2 libpmc.so. pmclog_read 1.2 kernel if_transmit 1.1 kernel arpresolve 1.1 kernel arge_start 1.0 kernel netisr_dispatch_src 1.0 kernel ether_demux 0.9 kernel _rm_runlock 0.9 kernel uma_zalloc_arg 0.9 kernel generic_bs_barrier CONVERSION STATISTICS:input #samples/total 75152 #samples/unknown-function 2180 And why so heavy usage of _libmd_SHA256_Transf ?
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