Date: Tue, 31 Dec 2002 17:24:14 +0900 From: Hajimu UMEMOTO <ume@mahoroba.org> To: hawkeyd@visi.com Cc: m.seaman@infracaninophile.co.uk, freebsd-hackers@freebsd.org Subject: Re: Multi-threaded or async Mozilla (NSPR, really) Message-ID: <ygesmwek34h.wl%ume@mahoroba.org> In-Reply-To: <200212310156.gBV1ukw03272@sheol.localdomain> References: <20021222071854.A86914_sheol.localdomain@ns.sol.net> <20021222154722.GA8522_happy-idiot-talk.infracaninophi@ns.sol.net> <200212310156.gBV1ukw03272@sheol.localdomain>
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Hi,
>>>>> On Mon, 30 Dec 2002 19:56:46 -0600 (CST)
>>>>> D J Hawkey Jr <hawkeyd@visi.com> said:
hawkeyd> In article <20021222154722.GA8522_happy-idiot-talk.infracaninophi@ns.sol.net>,
hawkeyd> m.seaman@infracaninophile.co.uk writes:
> On Sun, Dec 22, 2002 at 07:18:54AM -0600, D J Hawkey Jr wrote:
>
>> I can't imagine what Moz is doing within it's DNS code, even with the
>> serialized DNS lookups. If nslookup replies within fractions of a second,
>> why doesn't Moz??
>
> Take a look at look at the getaddrinfo(3) man page and then try doing
> a look up of the AAAA or A6 records for the troublesome locations.
hawkeyd> After looking at the man page, and understanding all of ~35% of it, I'll
hawkeyd> ask this: Are you referring to the oft-mentioned, ill-configured, INET6
hawkeyd> records in some DNS servers, or are you referring to less-than-correct
hawkeyd> code in FreeBSD's TCP/IP stack, or are NSPR's routines indeed flawed?
hawkeyd> I guess I'll ask this, too: is getaddrinfo(3) called by gethostbyname(3)?
hawkeyd> It's the latter that Mozilla/NSPR calls, and is the blamed culprit.
Mozilla doesn't call getaddrinfo(). Mozilla uses gethostbyname2() to
resolve hostname. Since gethostbyname2() doesn't have a capability of
querying A RR and AAAA RR at same time, Mozilla calls gethostbyname2()
for AAAA RR 1st, then calls gethostbyname2() for A RR.
hawkeyd> For giggles, I disabled INET6 in the kernel, re- built and installed it,
hawkeyd> and the problem vanished. But this doesn't answer the question: Is it
hawkeyd> problematic DNS records, a problematic OS, or what? The second, I doubt...
I believe that Mozilla should be re-written by using getaddrinfo().
Sincerely,
--
Hajimu UMEMOTO @ Internet Mutual Aid Society Yokohama, Japan
ume@mahoroba.org ume@bisd.hitachi.co.jp ume@{,jp.}FreeBSD.org
http://www.imasy.org/~ume/
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