Hi all and especially Ali, I have been working with the webnew benchmark (specweb95-apache) and have noticed two problems that kill throughput and was wondering if you have encountered them or know what is happening
(1) All requests handled by the server server are coming back 404 (File) Not Found. Nate mentioned that you figured out this was due to a bad mod_specweb99.so. If you know what is going on in this situation, any help would be great. (2) Some simulations (a small subset) using a vanilla M5 kernel have the server receive a packet that it believes is Out-Of-Order (even though it has the right seq number that the server put in its previous ack). The result is the client sends a Dup ACK. The server does not respond for 200 ms and the client then times out and re-requests 6 files on 6 different ports (6 files in total). A more detailed account follows. The time delta between 1-2, 2-3, and 3-4 is 10s of microseconds 1): server responds to previous request with ack:232 len:431 2): client requests new file (GET) with seq:232 len:77 3): server responds with TCP Out-Of-Order with ack:232 len:431 4): client responds with TCP Dup ACK with seq:309 len:0 5): client times out and re-requests files with seq:239 len:77 200ms later *this data is from the ethernet trace If you have experienced this problem and/or know of a solution, please let me know what I can do to avoid this disruptive pause in packet transmission. Best, -Rick _______________________________________________ m5-dev mailing list [email protected] http://m5sim.org/mailman/listinfo/m5-dev
