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Open Source and information security mailing list archives
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Date: Mon, 01 Oct 2007 16:44:50 -0400 From: John Heffner <jheffner@....edu> To: Chris Friesen <cfriesen@...tel.com> CC: linux@...konnect.de, netdev@...r.kernel.org Subject: Re: sk98lin, jumbo frames, and memory fragmentation Yes it has this problem. I've observed it in practice on a busy firewall. -John Chris Friesen wrote: > > Hi all, > > We're considering some hardware that uses the sk98lin network hardware, > and we'll be using jumbo frames. Looking at the driver, when using a > 9KB MTU it seems like it would end up trying to atomically allocate a > 16KB buffer. > > Has anyone heard of this been a problem? It would seem like trying to > atomically allocate four physically contiguous pages could become tricky > after the system has been running for a while. > > The reason I ask is that we ran into this with the e1000. Before they > added the new jumbo frame code it was trying to atomically allocate 32KB > buffers and we would start getting allocation failures after a month or > so of uptime. > > Any information anyone can provide would be appreciated. > > > Thanks, > > Chris > - > 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 - 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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