Date: Sat, 2 Sep 1995 21:07:34 -0400 From: dennis@et.htp.com (dennis) To: hackers@freebsd.org Subject: Re: novell ne2000 cards with FreeBSD...opinions? Message-ID: <199509030107.VAA26913@mail.htp.com>
next in thread | raw e-mail | index | archive | help
>>>Shared memory on my NE2000/WD8013EBT card is 50% faster, but that isn't >>>saying much. The driver spends half its time bcopying to the shared >>>... >>The bus transfer itself is a pretty small piece of the latency puzzle. But >>with a PIO card you have setup operations for every transfer...whereas with >>shared memory you can access individual bytes and the buffer without setup >>latency. > >The `ed' driver does bulk copies in both cases. Random access would >only be significantly faster if some of the data is never looked at and >none of the data is looked at twice. > Except when you're reading the header. It changes the way that you implement the logic. db
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199509030107.VAA26913>