Re: Fix for your serial/PPP problems
Could someone knowledgeable in low-level kernel matters take a look at the
following? I looked at the Web page, and though it sounds interesting
overall (and it WOULD solve a serial problem I experienced with Debian 1.1.1
and kernel 2.0.6), there appear to be some technical inaccuracies which give
me second thoughts. Any comments appreciated.
"Craig A. Estey" <cae@best.com> wrote
To: cae@best.com, atristan@galaxy.ucr.edu, bergan@northwest.com,
dpierce@i2k.net, ericc@arco.com,
gbutler@I_should_put_my_domain_in_etc_NNTP_INEWS_DOMAIN,
heitkamp@ibm.net, henryv@CS.Arizona.EDU, ilker@meceng.coe.neu.edu,
jakeg@einet.com, jkeenan@blkcat.com, knabe@ing.puc.cl,
legrand@tesla.mbi.ucla.edu, macgyver@sirweb.net,
marc.houppertz@ping.be, marko.mikulicic@span.ch, nahshon@best.com,
npetta@atw.fullfeed.com, pcg@aber.ac.uk, pjordan@gpu1.srv.ualberta.ca,
pmiller@nyx.cs.du.edu, rcb@bix.suba.com, rhl@CAM.ORG,
rloignon@infobahnos.com, rsh@Eng.Sun.COM, sam@hyperdream.com,
semich@ping.li, snellidc@ttown.apci.com, spaa9037@span.ch,
spam.man@vt.edu, tallpaul@prince.meitca.com, tooze@s-e-group.com,
troch@texas.com, u6ed4@wvnvm.wvnet.edu, whitney@math.berkeley.edu
>Hi, Folks
>
>All of you have posted problems with serial/PPP to comp.os.linux.* newsgroups
>(under various heading listed at the end of this message).
>
>I had exactly the same problems. I did some microsecond resolution performance
>profiling of the kernel. I found a kernel bug and devised a fix.
>I have been scanning the groups and have not found a similar fix anywhere.
>
>Online documentation (FAQ format) that explains all (the *real* problem is
>IRQ priority):
> http://www.best.com/~cae/irqtune
>
>The entire package:
> ftp://www.best.com/pub/cae/irqtune.tgz
>
>I've been running the patch for over a month and I tripled the throughput
>of my 33.6 modem from 700 chars/sec to over 2500 chars/sec. It also fixes
>data dropouts.
>
>I'm going to post this to the newsgroups but I need some testing in various
>configurations.
>
>Please give it a try. I'd greatly appreciate your feedback via email.
>Send your configuration data, what performance you got, what you think.
>
>Thanks,
>Craig Estey
>cae@best.com
>
>---------------------------------------------------------------------------
>Subjects:
>> Erratic IP forwarding via PPP
>> Hanging file transfers (ppp,linux 1.2.13)
>> Has SLIP gotten slower in 2.0.x?
>> Help with pppd error messages in syslog
>> How to measure speed of my pppp link
>> Linux:/PPP dead end! Do I need NT?
>> Modem quits after 20 seconds
>> Modem trouble (Need Help)
>> NFS over PPP usable?
>> Only getting half my bandwidth through modem (ftp)
>> PPP 2.2.0f connect to Xylogics Annex 4000 hangs
>> PPP Slowness
>> PPP hangs while sending large files
>> PPP problem even after looking at many references/posts to no avail
>> PPP routing problem
>> PPP unreliable
>> PPPD Problem w/ Pentium & Kernel 2.0.7
>> Q: SLIP comm waits on IDE disk
>> RTS/CTS flow control problems with Motorola BSP
>> Re: *very* slow SLIP
>> Re: Has SLIP gotten slower in 2.0.x?
>> Re: How to get precise interrupt timing? (reading RC PPM signal)
>> Re: PPP slow (450bytes/sec)
>> Re: PPP throughput, tuning, & network info
>> Re: Serial port problem with Linux-2.0.x (x > 3)
>> Re: Slow -> halt modem
>> Serial port problem with Linux-2.0.x (x > 3)
>> Speeding up telnet?
>> TCP connections and degrading performance
>> Unexplained PPPD hangups.
>> Weird PPP Latency Effect
>> help I have a very slow ppp connection
>> modem trouble(help)
>> ppp setup problem
>> ppp2.0.d problems. It a BUG or a configuration mistake ????
>> ppp: frame with bad fcs
>> serial handing bug in 2.0.12?
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