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<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:black">We’re seeing nice improvements but also significant degradations on IA, which we would like to investigate before the patch is committed.<o:p></o:p></span></p>
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<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:black">Major degradations we see:<o:p></o:p></span></p>
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networking<span style="font-size:11.0pt"><o:p></o:p></span></p>
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ip_pktcheckb1m -6.80 %<o:p></o:p></p>
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ip_pktcheckb2m -6.74 %<o:p></o:p></p>
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ip_pktcheckb4m -7.57 % <o:p></o:p></p>
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ip_pktcheckb512k -6.58 %<o:p></o:p></p>
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Telecom<o:p></o:p></p>
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autcor00data_1 -78.02 %<o:p></o:p></p>
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autcor00data_2 -76.80 %<o:p></o:p></p>
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autcor00data_3 -77.00 %<span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:black">
</span><o:p></o:p></p>
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<span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:black">(on Atom)</span><o:p></o:p></p>
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<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:black">We still working on creating reproducers.
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:black">In general we support this patch, just want to have a chance to investigate the issues. We need a few days for that.</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><a name="_____replyseparator"></a><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> llvm-dev [<a href="mailto:llvm-dev-bounces@lists.llvm.org">mailto:llvm-dev-bounces@lists.llvm.org</a>]
<b>On Behalf Of </b>Chandler Carruth via llvm-dev<br>
<b>Sent:</b> Tuesday, May 30, 2017 11:27<br>
<b>To:</b> Flamedoge <<a href="mailto:code.kchoi@gmail.com">code.kchoi@gmail.com</a>>; Dehao Chen <<a href="mailto:dehao@google.com">dehao@google.com</a>><br>
<b>Cc:</b> llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org">llvm-dev@lists.llvm.org</a>><br>
<b>Subject:</b> Re: [llvm-dev] Enable vectorizer-maximize-bandwidth by default?<o:p></o:p></span></p>
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<p class="MsoNormal">If you care about such hardware, please run benchmarks with the flag?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Dehao has made this flag available. It is important that those who care about particular hardware provid ebenchmark results. Not everyone in the community will have access to particular hardware variants.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Tue, May 30, 2017 at 1:14 AM Flamedoge <<a href="mailto:code.kchoi@gmail.com">code.kchoi@gmail.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">Thank you for running these.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">May I suggest testing on AVX2 capable hardware? That would be Intel Haswell, AMD Carrizo and up.<o:p></o:p></p>
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<p class="MsoNormal">I'm not sure what "<span style="font-size:9.5pt">vectorizer-maximize-bandwidth" implies, but doubling the vector lanes may help light up parallel regions.</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">Kevin</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Tue, May 30, 2017 at 12:58 AM, Chandler Carruth via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">On Fri, May 19, 2017 at 4:01 PM Adam Nemet via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">I will run it on Cyclone/AArch64 next week.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">FYI, we're still waiting on these Adam...<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">_______________________________________________<br>
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