shark and kernel/driver profiling
shark and kernel/driver profiling
- Subject: shark and kernel/driver profiling
- From: Andrew Gallatin <email@hidden>
- Date: Fri, 23 Feb 2007 15:10:39 -0500 (EST)
I was doing some profiling of my 10GbE driver on a MacPro (dual x2
2.66GHz, 10.4.8), and according to iostat, the load on the system is
53% when receiving traffic. Using 'shark -i' from the command line, I
created a time profile. According to this profile, the system is
spending:
<....>
- 1.3% m_freem_list (mach_kernel)
- 1.3% lck_mtx_lock (mach_kernel)
- 1.6% soreceive (mach_kernel)
- 1.6% sbtoxsockbuf (mach_kernel)
- 2.2% 0x2c75e000 [unreadable] (com.myricom.driver.myri10ge)
- 5.0% 0x2c75f000 [unreadable] (com.myricom.driver.myri10ge)
- 6.7% m_getpacket (mach_kernel)
- 18.4% copyout_kern (mach_kernel)
- 22.3% ml_set_interrupts_enabled (mach_kernel)
- 29.9% 0x24730000 [unreadable] (com.apple.driver.AppleIntelCPUPowerManagement)
I have a few questions:
1: What is com.apple.driver.AppleIntelCPUPowerManagement doing that is
taking up 30% of the time? Is this another term for "idle"?
If I click on it in the gui, it seems to be called by machine_idle_cstate.
2: Similarly for ml_set_interrupts_enabled..
3: How do I get my driver's symbols to resolve? I'm loading my driver
via kextload from the commandline, and I've pointed the "search paths"
for kexts at the directory my .kext file is located in. I'm also
loading with symbols, so com.myricom.driver.myri10ge.sym is in that
directory as well.
Thanks,
Drew
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