On 10/17/2016 01:10 PM, SF Markus Elfring wrote: >>> * Is a string pointer often longer than a byte? >>> >> Always. > > I have got doubts for this specific information. > > >> (Which up to now I thought was basic programming knowledge...) > > By the way: > Run time environments still exist where the size of a pointer can be also > just one byte, don't they? > Really? Name one. You can only fit a point in one byte if you are on an 8-bit system. Which I don't think linux is running on.
>>> How many results would we like to clarify from various hardware >>> and software combinations? >>> >> See above. At the moment _any_ test result from your side would do. > > I imagine that another single result might not be representative. > How many lessons from test statistics will usually be also relevant here? > > As said above, _any_ statistic will do at this point. >>> How important are the mentioned functions for you within the Linux >>> programming interface so far? >>> >> Not very. The interface is only used in a slow path, and the execution >> time doesn't affect I/O performance in any way. > > Thanks for another interesting information. > > >>>> Case in point: with your patch the x86_64 compiler generates nearly >>>> identical code for driver/md/raid1.c, but with one instruction _more_ >>>> after your patch has been applied. >>> >>> Which software versions and command parameters did you try out >>> for this information (from an unspecified run time environment)? >>> >> # gcc --version >> gcc (SUSE Linux) 4.8.5 > > Thanks for this detail. > > * Did you choose any special optimisation settings for your quick check? > > * Will any compilation results matter if "optimisation" would be > switched off there? > > These were the results when calling 'make' in the kernel source tree. With all applicable options. >> I'm still waiting from results from your side. > > Would any other software developers or testers dare to add related > information? > No. It's your patch, _you_ have to do it. Cheers, Hannes -- Dr. Hannes Reinecke Teamlead Storage & Networking h...@suse.de +49 911 74053 688 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton HRB 21284 (AG Nürnberg)
