Date: Tue, 17 Sep 1996 14:56:00 +1000 From: Bruce Evans <bde@zeta.org.au> To: craigs@os.com, jab@rock.anchorage.net Cc: freebsd-hardware@freebsd.org, hackers@freebsd.org Subject: Re: Slow Etherlink Message-ID: <199609170456.OAA10729@godzilla.zeta.org.au>
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>One thing I will say about Linux is that it has superior screen display >performance. So, if what you are complaining about is screen redraw >speed, Linux is much faster than FreeBSD. Really? Linux was 6-12 times slower last time I worked on speeding up syscons. >However, the redraw slowness >of FreeBSD does not show up under xterm. Perhaps you are noticing the redraw fastness of FreeBSD. Redraws for running vi over ethernet connections _seem_ to be very slow because there is a long pause after the data in the first packet is written. The pause is actually caused by delayed ACKs and may be avoided using the undocumented option TCP_ACK_HACK. This option was standard in FreeBSD-2.0 and in FreeBSD-current up to just before the release of 2.0.5. It was disabled because it caused problems with T/TCP. Linux has a similar option CONFIG_TCP_NAGLE_OFF. >Maybe it's the syscons driver, >try the other driver and see if that's faster. ... pcvt is much slower than syscons. Bruce Test notes and output: --- The test simply writes 2000 bytes of printable characters 1000 times. Other methods of writing to the screen are inherently slower (several lines can be written in the time that it takes to format and parse one escape sequence). ISA ET4000: 2.4MB/sec read, 5.9MB/sec write VLB ET4000/W32i: 6.8MB/sec read, 25.5MB/sec write PCI S3/868: 3.5MB/sec read, 23.1MB/sec write -o means stty flag -opost No-scroll: machine video O/S where real user sys speed --------- ------- -------------- --------- ----- ---- ----- ----- DX2/66 VLB ET4000/W32i FreeBSD-rcurrent offscreen-o 1.18 0.01 1.16 1.69 DX2/66 VLB ET4000/W32i FreeBSD-rcurrent onscreen-o 1.19 0.00 1.18 1.68 486/33 ISA ET4000 minix-1.6.25++ offscreen 2 0.01 1.45 1.37 486/33 ISA ET4000 minix-1.6.25++ onscreen 2 0.01 1.60 1.24 DX2/66 VLB ET4000/W32i FreeBSD-bcurrent offscreen 1.62 0.00 1.59 1.23 DX2/66 VLB ET4000/W32i FreeBSD-bcurrent onscreen 1.62 0.02 1.58 1.23 486/33 ISA ET4000 FreeBSD-bcurrent offscreen-o 2.28 0.03 2.24 0.88 486/33 ISA ET4000 FreeBSD-bcurrent onscreen-o 2.34 0.01 2.26 0.85 486/33 ISA ET4000 FreeBSD-current offscreen-o 2.50 0.00 2.46 0.80 486/33 ISA ET4000 FreeBSD-current onscreen-o 2.55 0.02 2.49 0.78 486/33 ISA ET4000 FreeBSD-bcurrent offscreen 3.17 0.00 3.15 0.63 486/33 ISA ET4000 FreeBSD-bcurrent onscreen 3.23 0.03 3.11 0.62 486/33 ISA ET4000 FreeBSD-current offscreen 3.48 0.03 3.41 0.57 486/33 ISA ET4000 FreeBSD-current onscreen 3.55 0.02 3.45 0.56 486/33 ISA ET4000 linux-1.1.36 offscreen 20.80 0.00 20.80 0.10 486/33 ISA ET4000 linux-1.1.36 onscreen 38.34 0.02 38.38 0.05 Scroll: machine video O/S where real user sys speed --------- ------- -------------- --------- ----- ---- ----- ----- 486/33 ISA ET4000 minix-1.6.25++ offscreen 2 0.00 1.70 1.18 486/33 ISA ET4000 minix-1.6.25++ onscreen 2 0.00 1.81 1.10 DX2/66 VLB ET4000/W32i FreeBSD-bcurrent offscreen-o 3.24 0.01 3.21 0.62 DX2/66 VLB ET4000/W32i FreeBSD-bcurrent onscreen-o 3.40 0.01 3.33 0.59 DX2/66 VLB ET4000/W32i FreeBSD-bcurrent offscreen 3.68 0.02 3.63 0.54 DX2/66 VLB ET4000/W32i FreeBSD-bcurrent onscreen 3.97 0.01 3.93 0.50 486/33 ISA ET4000 FreeBSD-bcurrent offscreen-o 5.38 0.02 5.32 0.37 486/33 ISA ET4000 FreeBSD-bcurrent onscreen-o 5.50 0.02 5.38 0.36 486/33 ISA ET4000 FreeBSD-current offscreen-o 5.71 0.02 5.64 0.35 486/33 ISA ET4000 FreeBSD-current onscreen-o 5.72 0.00 5.62 0.35 486/33 ISA ET4000 FreeBSD-bcurrent offscreen 6.42 0.03 6.36 0.31 486/33 ISA ET4000 FreeBSD-bcurrent onscreen 6.39 0.03 6.17 0.31 486/33 ISA ET4000 FreeBSD-current offscreen 6.68 0.02 6.62 0.30 486/33 ISA ET4000 FreeBSD-current onscreen 6.73 0.03 6.54 0.30 486/33 ISA ET4000 linux-1.1.36 offscreen 23.56 0.03 23.60 0.08 486/33 ISA ET4000 linux-1.1.36 onscreen 40.26 0.00 40.27 0.05
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