Paolo Bonzini <pbonz...@redhat.com> writes: > Il 27/02/2013 12:21, Rusty Russell ha scritto: >>>> >> Baseline (before add_sgs): >>>> >> 2.840000-3.040000(2.927292)user >>>> >> >>>> >> After add_sgs: >>>> >> 2.970000-3.150000(3.053750)user >>>> >> >>>> >> After simplifying add_buf a little: >>>> >> 2.950000-3.210000(3.081458)user >>>> >> >>>> >> After inlining virtqueue_add/vring_add_indirect: >>>> >> 2.920000-3.150000(3.026875)user >>>> >> >>>> >> After passing in iteration functions (chained vs unchained): >>>> >> 2.760000-2.970000(2.883542)user >> Oops. This result (and the next) is bogus. I was playing with -O3, and >> accidentally left that in :( > > Did you check what actually happened that improved speed so much?
No, it was a random aside, I didn't dig into it. Perhaps we should revisit using -O3 on the entire kernel, or perhaps grab gcc 3.8 and see how that performs. But I'm implementing specialized virtqueue_add_outbuf() and virtqueue_add_inbuf() which seem to get more improvement anyway (except occasionally I get hangs in my tests, which I'm debugging now...) Cheers, Rusty. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
