Date: Tue, 30 May 2017 11:26:26 -0700 From: Adrian Chadd <adrian@freebsd.org> To: Emeric POUPON <emeric.poupon@stormshield.eu> Cc: freebsd-arch <freebsd-arch@freebsd.org> Subject: Re: numa and taskqueues Message-ID: <CAJ-VmomtfHb7W_4c2OGpQ%2B4CF1jzsV4jvkyi0nVQtLNvx8XyYQ@mail.gmail.com> In-Reply-To: <608664209.55736023.1496155561181.JavaMail.zimbra@stormshield.eu> References: <1914359731.54283525.1495178031163.JavaMail.zimbra@stormshield.eu> <CAJ-Vmo=6bpo1Yu6XosN3BiYOakjeXS8J7wenfubzkWz2SxXR1g@mail.gmail.com> <816581118.55670987.1496141816904.JavaMail.zimbra@stormshield.eu> <CAJ-Vmo=h3ASXiFWYT1E=xHQ%2BzZ_5%2B027dXibbPezj2CcHvGxVg@mail.gmail.com> <608664209.55736023.1496155561181.JavaMail.zimbra@stormshield.eu>
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On 30 May 2017 at 07:46, Emeric POUPON <emeric.poupon@stormshield.eu> wrote: > Hi, > >> >>> 2/ about https://reviews.freebsd.org/D10680, I think it would be great to have >>> this commited as a first step. >>> Since it seems to be stuck, maybe I can add more people on this. Any suggestion? >> >> Well, what's with the ~ 8% performance decrease? Do you know what's >> going on? For a "we're parallelising IPSEC operations", seeing it get >> slower with more flows is a bit concerning. >> >> Thanks, >> > > Actually, there is a performance boost only when few flows are involved. > That's why this is not activated by default and a sysctl is here to enable the feature. > > To sum up, the more different flows you process (both ciphered and unciphered), the more network queues are hit and the more CPU units are triggered from ipsec. > In this case, we indeed notice a loss, certainly due to the extra queing/reordering performed. Can you dig into that a bit more? Do you know exactly what's going on? eg, is it a "lock contention" problem? Is it a "stuff is context switching, thus latency" problem? etc, etc. -adrian
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