Date: Sun, 17 Sep 2006 15:47:07 +1000 From: Michael Vince <mv@thebeastie.org> To: Bill Blue <bblue@netoldies.com> Cc: "freebsd-stable@freebsd.org" <freebsd-stable@freebsd.org> Subject: Re: Polling and em0 Message-ID: <450CE15B.3060806@thebeastie.org> In-Reply-To: <op.tfzin5x2zq5pz4@sovaio.netoldies.com> References: <op.tfzin5x2zq5pz4@sovaio.netoldies.com>
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Bill Blue wrote: >polling(4) says that supported devices include em(4) and that polling support is turned on and off with ifconfig's 'polling' option. But ifconfig doesn't seem to recognize that option either as a standalone request or with the initial em0 setup at boot. > >This is after a source cvsup (releng=6 for the frozen for 6.2 sources) yesterday and buildworld + buildkernel. em support is compiled in the kernel rather than loaded. Mobo is a Supermicro P4SCT-0 with Intel 875 chipset. > >Is this a known issue that I haven't found references to, or perhaps something related to my specific configuration? > >FreeBSD v2.netoldies.com 6.2-PRERELEASE FreeBSD 6.2-PRERELEASE #0: Fri Sep 15 15:14:07 PDT 2006 root@v2.netoldies.com:/usr/obj/usr/src/sys/V2KERNEL i386 > >Thanks > >--Bill > > > Since 6.1 I have stopped using polling as a regular kernel seems to give good performance as compared to polling mode. In fact I used to get anything between 55-75megs/sec on 6.1 with regular cables but since upgraded to cat6 quality Ethernet cable I get practically full gigabit speed with no polling. Close to 97megs/sec is the performance I get out of my Dells with the em driver, and apparently the new em driver in 6-stable 6.2 is even faster. em(4) Dell to em(4) Dell dell1# cat /dev/zero | dd bs=1m | nc dell2 3000 ^C0+18456 records in 0+18455 records out 1209466880 bytes transferred in 12.459299 secs (97,073,429 bytes/sec) Mike
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