Messages in this thread | | | From | (Alan Cox) | Subject | Re: 2.2.5 optimizations for web benchmarks? | Date | Fri, 16 Apr 1999 11:10:53 +0100 (BST) |
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> for a web benchmark. I understand many of the tunables > in /proc/sys, but I'm not sure if I'm missing something > crucial.
You actually probably don't need to tune them
> Assuming fast hardware, with lots of RAM (ranging from > 512MB - 2GB), and with/without RAID (software), and a > fast network (yellowfin or eepro100), and ext2fs.
For 2Gig of RAM you want to recompile as per the directions in the kernel tree (include/asm-i386/page.h) to use an offset of 0x80000000.
> What should I change at 2.2.5 compile time? I'm > especially curious if increasing the initial tcp cwnd > to min (4380, 4*MSS) as suggested by IETF/tcpimpl would
It will do for an http/1.0 test, it doesn't for real world. You can tell if its a factor because you will see much less than 100% CPU usage and that adding clients increases performance.
> connections of the benchmark (I presume I'd have to > change both snd_cwnd and snd_cwnd_cnt)
Yes
> Will I get any benefit from changing the tunables in eepro100.c and > yellowfin.c ?
There is nothing there you need to touch
> inode-max > bdflush > buffermem > freepages > kswapd > pagecache > Any other I'm missing ?
You shouldnt need to touch those either.
> I'm using many of the common apache 1.4.3 > optimizations. Is there anything I can do to improve > SMP performance, to help the built in affinity-scheme > of linux?
Apache does fine with the default CPU affinity. You probably need to tune the apache configuration more than anything else. You want the logging and swap on a different disk to the pages and to the system preferably. For the raid you want striping (obviously) and the raid howto/tools tell you how to find the optimal stripe size.
If you want to answer the question "how fast is linux as a web server" consider benchmarking using Zeus (www.zeus.co.uk) too.
Alan
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