On Mon, 11 Dec 2006, Josef Weidendorfer wrote: > > A general question: How many context switches are involved in such > a producer/consumer scenario, given that the consumer writes one > line at a time, and the consumer uses poll/select to wait for the > data? > Is there some possibility to make the kernel write-combine single > small producer writes into bigger chunks, which will be delivered > at once (or smaller data only after a small timeout)? The data will be write-combined. The kernel doesn't context-switch after a write() to a pipe if there is space left (and usually the pipe buffer is 64kB with current kernels, so there obviously will be), unless the reader has a higher priority for some reason (ie the reader has been waiting a long time). So _normally_ you'll see many many writes in one go, and only see context switching when the kernel pipe buffer fills up. Linus - To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html