-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi all, I hope this is the right list for discussion of this topic... It appears that Scientific Linux is used by many science communities, but in particular by the HEP community. The science community often has significant bulk data movement requirements that are outside the capabilities of the default network tuning parameters of most Linux distributions. Would the Scientific Linux community consider changing the network tuning defaults for future releases? ESnet maintains a site that explains network performance tuning and how to increase network performance - please see http://fasterdata.es.net/ However, we have recently seen several sites where the first thing that is needed is to change the network stack parameters so that high-performance wide-area data transfers are possible. Note that with today's TCP autotuning and modern congestion recovery algorithms, one need not set up particular TCP parameters on a per-destination basis. One need only give TCP autotuning enough buffer space to do its work and ensure that a modern congestion recovery algorithm is used (the default in Linux 2.6 has been cubic for a while, though 2.6.18 has bugs in cubic that significantly damage performance so for 2.6.18 one should use htcp instead). Please see http://fasterdata.es.net/tuning.html and http://fasterdata.es.net/TCP-tuning/linux.html for linux-specific information. Thoughts? Comments welcome.... Many thanks, --eli - -- Eli Dart NOC: (510) 486-7600 ESnet Network Engineering Group (800) 333-7638 Lawrence Berkeley National Laboratory PGP Key fingerprint = C970 F8D3 CFDD 8FFF 5486 343A 2D31 4478 5F82 B2B3 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkpXjZsACgkQLTFEeF+CsrNgwwCfWIdWXFJgFicBRx8MjmOrME87 r8AAn14OAESa9ciJTBKasfUsof5lW4Wv =gifQ -----END PGP SIGNATURE-----