Date: Fri, 30 Jan 2015 17:00:14 -0800 From: hiren panchasara <hiren@strugglingcoder.info> To: sbruno@freebsd.org Cc: freebsd-net@freebsd.org Subject: Re: Intel 82574L (em) Message-ID: <20150131010014.GB19333@strugglingcoder.info> In-Reply-To: <54CBF396.3090903@ignoranthack.me> References: <54CBF396.3090903@ignoranthack.me>
next in thread | previous in thread | raw e-mail | index | archive | help
[-- Attachment #1 --] On Fri, Jan 30, 2015 at 01:11:50PM -0800, Sean Bruno wrote: > > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA512 > > http://www.intel.com/content/dam/doc/datasheet/82574l-gbe-controller-datasheet.pdf > > According to 7.1.11, this device does indeed have 2 queues for stuff and > or things. So, basic RSS would be possible in something like an Atom box. > > I note that the em(4) driver intentionally disables this on > initialization. I'm up for some science on my new shiny, soon to be > router box. Any reason not to default to 1 queue and allow loader.conf > to raise it to 2? Intel folks know better but it seems this is hartwell. em_setup_msix() in very start says: /* ** Setup MSI/X for Hartwell: tests have shown ** use of two queues to be unstable, and to ** provide no great gain anyway, so we simply ** seperate the interrupts and use a single queue. */ Things may have changed now. I guess you can try enabling it and find out :-) cheers, Hiren [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (FreeBSD) iQF8BAEBCgBmBQJUzCkeXxSAAAAAAC4AKGlzc3Vlci1mcHJAbm90YXRpb25zLm9w ZW5wZ3AuZmlmdGhob3JzZW1hbi5uZXRBNEUyMEZBMUQ4Nzg4RjNGMTdFNjZGMDI4 QjkyNTBFMTU2M0VERkU1AAoJEIuSUOFWPt/lOEoH/3DL/joxvDlITP12IY6rGJZn dAzkJT7AIUlu3YgJmO518v1RvtqUnT+zWLkwd5b096WSpV9KI9WJs685rINNa4ab 8K8ou/RMbtdTwi9V6EYrysUZm+w8kcn7LE0BgiH3wTCsZIHAiyuqKjrFMhOlcw28 Ti4d+tcjB/hWxHUMo4qjrenTD6jh1iTE80uLY9wEh6LP1//ASnVrSFEhPJPcro+4 BchDFVs0I8YIW4aS5TUxUNZR5MxnghAu4Q1DpGEOCscqi4GToeVTIoBsYqO+9EpO RRY1ag4nALDIGVptu3K7QURFWZ5/GsoaWEv04uoBMJ1G/wpioIyo9eIeMrzjbDU= =n/u8 -----END PGP SIGNATURE-----
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20150131010014.GB19333>