Date: Wed, 29 Apr 1998 16:14:51 -0500 From: Chris Csanady <ccsanady@friley585.res.iastate.edu> Cc: current@FreeBSD.ORG Subject: freebsd-net mailing list? (Re: Bandwidth throttling etc.) Message-ID: <199804292114.QAA00921@friley585.res.iastate.edu> In-Reply-To: Your message of "Fri, 24 Apr 1998 19:16:36 CDT." <199804250016.TAA01428@friley585.res.iastate.edu>
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There seems to be a growing interest in networking--would it be possible to have a freebsd-net mailing list created for technical discussion of networking? Aside from that, I have to wonder if the below part of my earlier message was simply missed, or just plain ignored. I am describing a serious and real problem here--something that needs to be dealt with. It can cause *horrible* performance for some applications. Earlier someone posted about a web server getting 5 transactions/sec. This also had terrible effects on our clustering performance until we disabled the delayed acks. The problem basically causes throughput to effectively drop to *zero* for some message sizes. That being said, my intent is not whine and complain about this until someone fixes it. Rather, I would simply like to see some discussion of the problems.. Chris Csanady -- [ talk of increasing cluster size deleted ] >Whether we use mbufs clusters or whatever, the packets should be >contiguous. I think that this in itself causes somewhat of a problem >with regards to the current socket buffer handling. Currently, the fact >that the advertised window is calculated based on the total memory consumed >by the mbufs--and not only the data, is causing serious performance >problems. This interaction with delayed acks is the only Really Bad thing >wrong with our stack that I have noticed. > >I believe that BSDI has done some work to deal with this by creating an >m_compress function that collapses wasted space. [ other random networking stuff deleted ] To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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