Evgeniy Polyakov wrote: > On Thu, Aug 03, 2006 at 08:09:07PM +0200, Arnd Hannemann ([EMAIL PROTECTED]) > wrote: >> Evgeniy Polyakov schrieb: >>> On Thu, Aug 03, 2006 at 07:16:31PM +0400, Evgeniy Polyakov ([EMAIL >>> PROTECTED]) wrote: >>>>>> then skb_alloc adds a little >>>>>> (sizeof(struct skb_shared_info)) at the end, and this ends up >>>>>> in 32k request just for 9k jumbo frame. >>>>> Strange, why this skb_shared_info cannon be added before first alignment? >>>>> And what about smaller frames like 1500, does this driver behave similar >>>>> (first align then add)? >>>> It can be. >>>> Could attached (completely untested) patch help? >>> Actually this patch will not help, this new one could. >>> >> I applied the attached pachted. And got this output: >> >>> Intel(R) PRO/1000 Network Driver - bufsz 13762 >>> ...
>> I'm a bit puzzled that there are so much allocations. However the patch >> seems to work. (at least not obviously breaks things for me yet) > > Very strange output actually - comments in the code say that frame size > can not exceed 0x3f00, but in this log it is much more than 16128 and > that is after sizeof(struct skb_shared_info) has been removed... > Could you please remove debug output and run some network stress test in > parallel with high disk/memory activity to check if that does not break > your system and watch /proc/slabinfo for 16k and 32k sized pools. The system seems to be still stable. >From /proc/slabinfo during netio test: > size-32768(DMA) 0 0 32768 1 8 : tunables 8 4 0 : > slabdata 0 0 0 > size-32768 84 89 32768 1 8 : tunables 8 4 0 : > slabdata 84 89 0 > size-16384(DMA) 0 0 16384 1 4 : tunables 8 4 0 : > slabdata 0 0 0 > size-16384 184 188 16384 1 4 : tunables 8 4 0 : > slabdata 184 188 0 Netio results: NETIO - Network Throughput Benchmark, Version 1.26 (C) 1997-2005 Kai Uwe Rommel TCP connection established. Packet size 1k bytes: 72320 KByte/s Tx, 86656 KByte/s Rx. Packet size 2k bytes: 71400 KByte/s Tx, 94703 KByte/s Rx. Packet size 4k bytes: 71544 KByte/s Tx, 88463 KByte/s Rx. Packet size 8k bytes: 70392 KByte/s Tx, 92127 KByte/s Rx. Packet size 16k bytes: 70512 KByte/s Tx, 102607 KByte/s Rx. Packet size 32k bytes: 71705 KByte/s Tx, 101083 KByte/s Rx. Done. Strange ist that receiving seems to be much faster than transmitting. > -- > Evgeniy Polyakov Thanks, Arnd - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
