Date: Tue, 15 Oct 2002 23:26:55 -0700 From: Lars Eggert <larse@ISI.EDU> To: Petri Helenius <pete@he.iki.fi> Cc: Luigi Rizzo <rizzo@icir.org>, freebsd-net@FreeBSD.ORG Subject: Re: ENOBUFS Message-ID: <3DAD06AF.7060701@isi.edu> References: <065901c27495$56a94c40$8c2a40c1@PHE> <3DAC8FAD.30601@isi.edu> <068b01c2749f$32e7cf70$8c2a40c1@PHE> <20021015161055.A27443@carp.icir.org> <06c901c274d8$e5280b80$8c2a40c1@PHE> <3DAD01A7.3020807@isi.edu> <071501c274db$222c3ea0$8c2a40c1@PHE>
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This is a cryptographically signed message in MIME format. --------------ms030403000307050700010406 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Petri Helenius wrote: >>The 900Mbps are similar to what I see here on similar hardware. > > What kind of receive performance do you observe? I haven´t got that > far yet. Less :-) Let me tell you tomorrow, don't have the numbers here right now. > 600Mbps per interface. I´m going to try this out also on -CURRENT > to see if it changes anything. Interrupts do not seem to pose a big > problem because I´m seeing only a few thousand em interrupts > a second but since every packet involves a write call there are >100k > syscalls a second. So maybe syscalls/second are the bottleneck. On -current, try enabling zero copy sockets, it seems to help somewhat. Other than that, I've not found -current to be much different in terms of performance. If you're just interested in maxing throughput, try sending over TCP with large write sizes. In that case, syscall overhead is less, since you amortize it over multiple packets. (But there are different issues that can limit TCP throughput.) > I´ll try changing the packet sizes to figure out optimum. I think I remember that 4K packets were fastest with the em hardware in our case. Lars -- Lars Eggert <larse@isi.edu> USC Information Sciences Institute --------------ms030403000307050700010406 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIJtjCC AzgwggKhoAMCAQICEGZFcrfMdPXPY3ZFhNAukQEwDQYJKoZIhvcNAQEEBQAwgdExCzAJBgNV BAYTAlpBMRUwEwYDVQQIEwxXZXN0ZXJuIENhcGUxEjAQBgNVBAcTCUNhcGUgVG93bjEaMBgG A1UEChMRVGhhd3RlIENvbnN1bHRpbmcxKDAmBgNVBAsTH0NlcnRpZmljYXRpb24gU2Vydmlj ZXMgRGl2aXNpb24xJDAiBgNVBAMTG1RoYXd0ZSBQZXJzb25hbCBGcmVlbWFpbCBDQTErMCkG CSqGSIb3DQEJARYccGVyc29uYWwtZnJlZW1haWxAdGhhd3RlLmNvbTAeFw0wMDA4MzAwMDAw MDBaFw0wNDA4MjcyMzU5NTlaMIGSMQswCQYDVQQGEwJaQTEVMBMGA1UECBMMV2VzdGVybiBD YXBlMRIwEAYDVQQHEwlDYXBlIFRvd24xDzANBgNVBAoTBlRoYXd0ZTEdMBsGA1UECxMUQ2Vy dGlmaWNhdGUgU2VydmljZXMxKDAmBgNVBAMTH1BlcnNvbmFsIEZyZWVtYWlsIFJTQSAyMDAw 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