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Date: Wed, 14 Oct 2009 16:36:36 -0400 From: William Allen Simpson <william.allen.simpson@...il.com> To: netdev@...r.kernel.org Subject: Re: query: tcpdump versus atomic? Stephen Hemminger wrote: > On Wed, 14 Oct 2009 11:20:12 -0400 > William Allen Simpson <william.allen.simpson@...il.com> wrote: > >> William Allen Simpson wrote: >>> Anybody know what code path tcpdump changes to running atomic? >>> >>> Is there a function to test whether you're running atomic? >>> >> To partially answer my own question, after laboriously #if'ing compiling >> section by section, it affects the tcp_minisockets.c code at >> tcp_create_openreq_child(). >> >> I've not found a function to test. I've found sk->sk_allocation, but >> that doesn't seem to be dynamically updated to reflect the current state. >> > did you look at your ethernet's drivers code to turn on promiscuous mode. > It could be leaving irq's or bottom half disabled. > [ 2.876485] eth0: RealTek RTL8139 at 0x2000, 00:40:2b:6b:61:36, IRQ 17 [ 2.876490] eth0: Identified 8139 chip type 'RTL-8101' No idea on the driver file name, but that's a fairly popular chipset, so the code should be fairly well reviewed. Still, tcp shouldn't be processed with interrupts disabled. That's *way* too much code.... And we need a function that tells us whether we're atomic already.... And better function header descriptions that mention the assumptions. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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