Date: Fri, 25 Jan 2002 21:00:41 +0000 From: Neil McGann <neil@neilmcgann.co.uk> To: freebsd-questions@FreeBSD.ORG Subject: UDMA and 100Mbit NIC speed issues Message-ID: <5.1.0.14.0.20020125204321.00a0f4c0@pop.ntlworld.com>
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I'm seeing a problem with network upload speed using 4.4-Release when the HD is in DMA mode. Basically the same as problem report kern/32338, but the possible fix doesn't work for me. Machine is a ASUS Cuple-vm mobo (VIA PLE133), 400MHz celeron, Netgear FA311 NIC and IBM 60GX 60Gb deskstar on ULTRA100. Network is full-duplex thro a 100Mbit switch. Symptom is ftp upload is very slow in DMA HD mode 5 and much faster in PIO mode. I see up/down of a (approx.) 100Mb file at 50s/29s in PIO and 3m50s/33s in UDMA. I have tried disabling the on-board video, and then using a 3Com 3C905B NIC, but the massive slowdown is the same. I tried a different FA311 in a dual-boot Linux 2.4.x/Win 2K machine with a 40Gb version of the same IBM drive (but a ULTRA66 controller on a 1GHz PIII) and Linux showed _exactly_ the same slow-down symptom as FreeBSD. Win2K didn't slow down - it was faster overall in TCP/IP (40sec/15sec) and MUCH faster in SMB (15sec/15sec). So - what is killing the performance in FreeBSD (and Linux) where Win2K is much faster???? (is w2K doing adaptive disk throttling to maximise network bandwith???) Anyone got suggestions of how to start looking at this? I'm relatively new to freeBSD and very pleased with it overall, but on the same hardware W2K wipes the floor with it on sheer network/disk speed (at least on UDMA/100Mbit). Neil To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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