Messages in this thread | | | Subject | Re: [RFC] Direct Sockets Support?? | Date | Tue, 8 May 2001 21:50:57 +0100 (BST) | From | Alan Cox <> |
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> a. when a user app wants to receive some data, it allocates > memory(using malloc) and waits for the hw to do zero-copy read. The kernel > does not allocate physical page frames for the entire memory region > allocated. We need to lock the memory (and locking is expensive due to > costly TLB flushes) to do this > > b. when a user app wants to send data, he fills the buffer > and waits for the hw to transmit data, but under heavy physical memory > pressure, the swapper might swap the pages we want to transmit. So we need > to lock the memory to be 100% sure. >
Or c) you prealloc two ring buffers.
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