Quoting r. Grant Grundler <[EMAIL PROTECTED]>: > Subject: Re: performance counters in /sys > > On Fri, May 20, 2005 at 10:20:29AM -0600, Ronald G. Minnich wrote: > > yes, that is the accepted thing nowadays. And, boy, is it SLOW. SLOW, > > SLOW, SLOW. > > Open file, read ONE value, close file. Takes a long time. So we've seen > > that for a number of values you really can't sample at interesting rates. > > Exactly. That's Mark's gripe too. > > > Of course, you can speed it up a bit -- keep your files open, right? > > open once, read, fseek 0, read, ... > > Except then, if you need to unload the module, well, you can't: you have > > the /sys files open and the module can't really be unloaded. > > That's good, IMHO.
It will also prevent hotplug from working. So no, I dont think its good. > Unloading the HCA driver will disable the device. > On ia64 platforms (and probably PPC too) will lead to hard fail on the > next MMIO read since the device won't respond to MMIO space accesses. > > "lsof /sys/class/infiniband" would help track down the monitoring tool. Who would do MMIO reads if the driver is unloaded? -- MST - Michael S. Tsirkin _______________________________________________ openib-general mailing list [email protected] http://openib.org/mailman/listinfo/openib-general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
