<div dir="ltr"><div dir="ltr"><br></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Tue, Aug 26, 2025 at 3:50 PM Bruce Richardson <<a href="mailto:bruce.richardson@intel.com">bruce.richardson@intel.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div><br>> No problem. <br>> BTW: Please don't top-post in replying - it's best practice to put<br>> the reply below the text you are replying to. Thanks.<br><br>Ohh, I got it :) <br></div>I was triming the quotes when replying but in top-post format, <br></div>will always try to avoid top-post in replying in future! <br><div> <br><div>> AVX2 was first available in systems starting in 2013, (and AMD systems<br>> since 2015), so at this point it's been around a long time. The SSE code<br>> paths in the drivers will only be used by systems which do not have AVX2 on<br>> them - which should be relatively rare, I hope, at this point. There are no<br>> features in the SSE driver that are not available in the AVX2 one, so, I'm<br>> not aware of any reason why one would need to use the SSE code path in a<br>> deployment of DPDK.<br></div><div><br></div><div>Yes, I think all feaures in SSE do already exists in AVX2 paths. </div><div>
<br>> Even without this patch, there will be no features added to the SSE code<br>> paths in the drivers. Any new additions would just be to the AVX2 and<br>> AVX-512 code paths. Even for systems without AVX2, if the SSE path is<br>> removed the driver will fall-back to the scalar paths, which have far more<br>> features available in them than the SSE codepaths, which were simplified for<br>> performance reasons.<br><br></div><div>Thanks for the update. I could not exaclty got the meaning of fall-back to the scalar path. <br>Does that means <span><span class="gmail-ui-provider ed gmail-bqs gmail-bqt gmail-bqu gmail-bqv gmail-bqw gmail-bqx gmail-bqy gmail-bqz gmail-bra gmail-brb gmail-brc gmail-brd gmail-bre gmail-brf gmail-brg gmail-brh gmail-bri gmail-brj gmail-brk gmail-brl gmail-brm gmail-brn gmail-bro gmail-brp gmail-brq gmail-brr gmail-brs gmail-brt gmail-bru gmail-brv gmail-brw gmail-brx gmail-bry gmail-brz" dir="ltr">that the driver automatically switches to the scalar path ?<br>which is slower but includes all the necessary features that were simplified in the AVX2 path. </span></span> <br>I believe AVX2 provides an average performance much better for small frame or packet size (about 14 Gbps). <br><br></div><div>Reagards,<br></div><div>Khadem </div><div>
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