Hi michi, Its is using a TCP/IP protocol, program is Intel's MPI benchmark IMB, and CPU is surely not a bottelneck because its Quad core Quad socket machine with 64GB of physical mem. its a proprietary device for Systems Area Networks used for cluster computing. But the main problem that I have observed is, my device do not get any packets to post during this data size thats why I am trying to look beyond my device related functions. On Fri, Apr 17, 2009 at 1:49 PM, Michael Blizek <michi1@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > Hi! > > On 11:03 Fri 17 Apr , Devesh Sharma wrote: >> Hello list, >> >> I have written a network device driver, and to validate it, I am >> running a bandwidth measurement tool on it, >> I am encountering a strange drop in bandwidth when data size reaches >> to 4096, bandwidth figures drop form 24 Mbps (for 2k data size) >> to .43 Mbps. what can be the problem, the MTU of my device is 2044. Is >> it some how related to functioning of hard_start_xmit? > > What program/protocol do you use for testing + what kind of device is > this? The CPU is not a bottleneck, is it? > > -Michi > -- > programing a layer 3+4 network protocol for mesh networks > see http://michaelblizek.twilightparadox.com > > -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
