Date: Thu, 1 Mar 2007 12:12:58 +1030 From: "Daniel O'Connor" <doconnor@gsoft.com.au> To: freebsd-hackers@freebsd.org Subject: PCI slave performance (OT?) Message-ID: <200703011212.59136.doconnor@gsoft.com.au>
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--nextPart2424579.2sQUaeOuOM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Hi, We make a custom PCI card used for transferring data from our radar system= =20 acquisition chassis to a PC. It is rather old and we are looking at updatin= g=20 it but I would like to try and squeeze out as much performance as possible = to=20 satisfy our existing customers. It is a PCI slave only device using a PLX-9051 to read data from a FIFO. Th= is=20 means that we can't use prefetch or bursting because the PLX chip can throw= =20 data away in these circumstances :( Anecdotal evidence suggests that the maximum sustainable speed has dropped= =20 when we switched from 4.x to 6.x, but we also changed from i386 to amd64 an= d=20 used different motherboard chipsets so it's difficult to know where the=20 problem really lies. I plan on doing some tests to try and determine what is causing the slow do= wn=20 but I would appreciate any suggestions people may have :) One idea I did have was to get a dual core CPU and then one core would spen= d=20 all its time reading from the PCI bus while the other did data processing,= =20 etc.. Any suggestions gratefully received! =2D-=20 Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C --nextPart2424579.2sQUaeOuOM Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (FreeBSD) iD8DBQBF5i+j5ZPcIHs/zowRAgrQAJ90VVA8WmgIdDkPGca5VuCH4ozLSQCdHMIy po2kNp8jtfXB06c3TT/aY4s= =s+T9 -----END PGP SIGNATURE----- --nextPart2424579.2sQUaeOuOM--
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