From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Greaves Subject: Re: Looking for the cause of poor I/O performance Date: Fri, 03 Dec 2004 16:32:43 +0000 Message-ID: <41B0952B.1000302@dgreaves.com> References: <200412030630.51004.systemloc@earthlink.net> <20041203114635.GB21302@harddisk-recovery.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <20041203114635.GB21302@harddisk-recovery.com> Sender: linux-raid-owner@vger.kernel.org To: Erik Mouw Cc: TJ , linux-raid@vger.kernel.org List-Id: linux-raid.ids I paid about =A350 for a 5port gig switch I have 3 e1000 cards (about =A330 each) - they're relegated to doorstop= s=20 I'm afraid :( Despite months of trying they just won't work with my consumer VIA/AMD=20 systems (and Ganesh and gang have tried) I'm now using even cheaper Marvell based SMC EZ1000s (=A320ish) - I dou= bt=20 I'll get close to the throughput the e1000s could achieve - but I get 3= =20 times more then fast ethernet (and about 10 times more than e1000s)=20 which is worthwhile. David Erik Mouw wrote: >On Fri, Dec 03, 2004 at 06:30:51AM -0500, TJ wrote: > =20 > >>I'm cheap. I use a crossover so I didn't have to spring for the switc= h. The=20 >>NICs are Intel 82540EM's. I got them for around $55 per. I didn't thi= nk that=20 >>was too bad for gigabit. Of course, these controllers may be complete= trash,=20 >>I dunno.=20 >> =20 >> > >You won't do any better than fast ethernet when you're using a >crossover cable. Gigabit ethernet doesn't need crossover cables for >direct connections, it uses all four wire pairs in cat5 cable and will >automatically figure out if there's a direct connection and do the >right thing (all mandatory by the gigE standard, so every NIC will >support it). If you use a fast ethernet cross cable, the NICs will >autonegotiate to 100 MB/s full-duplex. > >The Intel gigE NICs are very good: good hardware, good driver, good >support. Gigabit ethernet switches are becoming rather cheap: 200 EUR >buys you an 8 port switch. > > >Erik > > =20 > - To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html