The following are brief descriptions of tuning parameters used in SPECweb96 submittals for HP 9000 computers running HP-UX 11.00 and later: Tunes applied with /usr/bin/ndd: tcp_conn_request_max - Max number of outstanding connection request. Default 20. tcp_xmit_hiwater_def - The amount of unsent data that triggers TCP flow control. Default 32768 bytes. tcp_conn_strategy - Should TCP connection establishment and teardown optimize for space (value 0) or time (value 1). Default 0. Tunes applied by editing /stand/system and regenning the kernel: maxfiles - The soft limit for the maximum number of files open per process. Default 60. maxfiles_lim - The hard limit for the maximum number of files open per process. Default 2048. maxuproc - The maxium number of user processes on the system. Default depends on other tuneables. ninode - The size of the inode cache. Default depends on other tunables. nfiles - The maximum number of open files on the system. Default depends on other tuneables. tcphashsz - Control the sizes of various transport data structures. Default is 256? Tunes applied by running chatr(1m) against program files: +pi L - Set the executable to use the largest page size possible for program text. Default is 4KB. Tunes applied by specifying option with the mount command: MS_BEHIND - writes to disk are to be done asynchronously, where possible, without waiting for completion. The default is MS_DELAY. Tunes for the Gigabit Ethernet cards applied by running gbeutil ("gbeutil /dev/gelan* "): write send_max_bufs 32 - coaslesce 32 buffers before updating the Send Consumer Index. The default is 16. write recv_max_bufs 12 - coaslese 12 buffer descriptors before updating the Receive Return Ring Producer Index. The default is 1. write recv_coal_ticks 10000 - set the wait timer for the receive descriptors to 10000 clock ticks. The default is 0 (disabled). Tunes for ATM cards applied by running alxtune: set non_dist_int on - Disable distribution of interrupts for specified card. Default off.