Messages in this thread | | | Date | Wed, 11 Nov 2015 14:48:40 -0500 (EST) | Subject | Re: [PATCH v5] net: ethernet: add driver for Aurora VLSI NB8800 Ethernet controller | From | David Miller <> |
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From: Måns Rullgård <mans@mansr.com> Date: Wed, 11 Nov 2015 19:35:05 +0000
>> I don't think it's silly at all. > > I'm sure I read somewhere that the time spent spinning on a lock should > be kept as small as possible. > >> And unless you can measure it making a difference, don't knock the idea. > > I tried using netif_tx_lock() in the IRQ handler instead, and it locked > up solid. Clearly that was the wrong thing to do.
Oh that's right, it's a BH lock not an IRQ one.
Yet another argument for doing everything in ->poll(), thus making all operations outside of NAPI scheduling run in software interrupt context, and therefore being able to make use of the TXQ lock for this.
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