Date: Thu, 18 Jul 1996 09:34:18 +1000 From: Bruce Evans <bde@zeta.org.au> To: dennis@etinc.com, stefan@Promo.DE Cc: hackers@freebsd.org Subject: Re: mitsumi CD-ROM Message-ID: <199607172334.JAA03113@godzilla.zeta.org.au>
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>If I understand you correctly, you want the disk controller only to = >consume resources when there is no network activity; I'm not too familiar = >with PCI's or FBSD's arbitration logic, but I assume that FBSD will try = >to service disk controllers before network controllers (please correct me = >on this). No, the priorities are only parially ordered. Disk controllers may interrupt nextwork controllers and vice versa. >I'm sure one could change that with some effort to give the nic = >the higher priority. Tiny effort: `imp_imask |= bio_imask;' >However, if you're intention is to really make this one router forward = >packets with lower latency, you might want to try to run it completely = >off MFS; then there will be no disk activity at all. There will be, at more-unpredictable times than for a hard disk, when the MFS fills up. Bruce
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