Date: Sat, 28 Jun 1997 20:57:08 -0700 (PDT) From: Simon Shapiro <Shimon@i-Connect.Net> To: Bruce Evans <bde@zeta.org.au> Cc: bmcgover@cisco.com, hackers@FreeBSD.ORG Subject: Re: Clists limited to 1024 bytes? Message-ID: <XFMail.970628205708.Shimon@i-Connect.Net> In-Reply-To: <199706281353.XAA30041@godzilla.zeta.org.au>
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Hi Bruce Evans; On 28-Jun-97 you wrote: ... Thanx for an excellent technical review. This type of posting is very useful. > Anyway, 19200 bps is not a heavy load unless there are a lot of active > ports. With 32 active 16550 ports it would be fairly heavy, but still > gives less than 6% of the throughput of a single 10Mb/s ethernet. I was thinking more (on a 16550) about what happens at 115,200, 230,400, and more. These are speeds we see already today with ISDN lines. The option of an external TA (such as a Motorola BitSRFR) is very apealing, but behavior at these speeds needs careful consideration. How would you adjust the drivers to acomodate these speeds? We experienced a lot of complex problems with SCSI transactions until we bumped the sio interrupt bufferto double its size. While performance (on the sio ports - we use them only for PPP) did not drop visibly, the strange incidence of dropping biodone() calls virtually stopped. Simon
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