Re: RX overrun with 3COM 3c982
Donald Becker <[email protected]>
| Newsgroups | gmane.linux.drivers.vortex.devel |
|---|---|
| Message-ID | <[email protected]> |
On Thu, 14 Nov 2002, Claude Pignol wrote: > Donald Becker wrote: > >On Wed, 13 Nov 2002, Claude Pignol wrote: > > > >>>The only source for FIFO errors with this speicific chip is the errors > >>>reported in Window 6 offset 5. > >>>These errors can occur either because > >>> The chip ran out of PCI bandwidth > >>> The driver ran out of receive buffers, causing the PCI Rx transfers > >>> (the "upload engine") to stall. > >>> > >>>Are you running another high-bandwidth PCI device on the system? Video > >>>cards are the usual offenders. ... > >>00:08.0 RAID bus controller: 3ware Inc 3ware ATA-RAID (rev 12) > > > >Hmmm, this might be doing long PCI bursts, not leaving enough for the > >Ethernet. If that's the case, the solution is to: > > Change the Min-grant / Max-Latency PCI settings > > Set the PCI bursts to much longer values, although the '982 has > > reasonable defaults. The registers to change are the > > UpBurstThreshold at offset 0x3e and > > UpPriorityThreshold, offset 0x3c, default 4*32 = 128 bytes. > > > >You can read the maximum burst that actually happened at offset 0x7a > >using vortex-diag. I wouldn't change the UpPriorityThreshold except for > >debugging -- 128 bytes is already a too-low value for whole-frame Rx bursts. > > > Well, I am little bit lost: > Is offset 7a (windows 7 and 10th byte): it's always 0?? Not the windowed registers, but the directly accessed registers. Oh, the external version of vortex-diag only shows up to offset 0x3f, not all of the registers. You can see some of these values by passing the '-g' option. I've just changed this in vortex-diag -- this will be in the next public version. > I don't know how to change the value of 0x3c > and 0x3e. but before trying to change them it's a good thing to locate > them. -- Donald Becker [email protected] Scyld Computing Corporation http://www.scyld.com 410 Severn Ave. Suite 210 Scyld Beowulf cluster system Annapolis MD 21403 410-990-9993 _______________________________________________ vortex mailing list [email protected] http://www.scyld.com/mailman/listinfo/vortex