From mboxrd@z Thu Jan 1 00:00:00 1970 From: Roy Sigurd Karlsbakk Subject: Re: [RESEND] tuning linux for high network performance? Date: Wed, 23 Oct 2002 15:36:24 +0200 Sender: netdev-bounce@oss.sgi.com Message-ID: <200210231536.24269.roy@karlsbakk.net> References: <200210231218.18733.roy@karlsbakk.net> <200210231306.18422.roy@karlsbakk.net> <200210231309.g9ND9Bp03373@Port.imtp.ilyichevsk.odessa.ua> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 8bit Cc: Kernel mailing list Return-path: To: vda@port.imtp.ilyichevsk.odessa.ua, netdev@oss.sgi.com In-Reply-To: <200210231309.g9ND9Bp03373@Port.imtp.ilyichevsk.odessa.ua> Errors-to: netdev-bounce@oss.sgi.com List-Id: netdev.vger.kernel.org > > > > 905182 total 0.4741 > > 121426 csum_partial_copy_generic 474.3203 > > Well, maybe take a look at this func and try to optimize it? I don't know assembly that good - sorry. > > 93633 default_idle 1800.6346 > > 74665 do_wp_page 111.1086 > > What's this? do_wp_page is Defined as a function in: mm/memory.c comments from the file: /* * This routine handles present pages, when users try to write * to a shared page. It is done by copying the page to a new address * and decrementing the shared-page counter for the old page. * * Goto-purists beware: the only reason for goto's here is that it results * in better assembly code.. The "default" path will see no jumps at all. * * Note that this routine assumes that the protection checks have been * done by the caller (the low-level page fault routine in most cases). * Thus we can safely just mark it writable once we've done any necessary * COW. * * We also mark the page dirty at this point even though the page will * change only once the write actually happens. This avoids a few races, * and potentially makes it more efficient. * * We hold the mm semaphore and the page_table_lock on entry and exit * with the page_table_lock released. */ > > > 65857 ide_intr 184.9916 > > You have 1 ide_intr per 2 csum_partial_copy_generic... hmmm... > how large is your readahead? I assume you'd like to fetch > more sectors from ide per interrupt. (I hope you do DMA ;) doing DMA - RAID-0 with 1MB chunk size on 4 disks. > > 53636 handle_IRQ_event 432.5484 > > 21973 do_softirq 107.7108 > > 20498 e1000_intr 244.0238 > > I know zero about networking, but why 120 000 csum_partial_copy_generic > and inly 20 000 nic interrupts? That may be abnormal. sorry I don't know -- Roy Sigurd Karlsbakk, Datavaktmester ProntoTV AS - http://www.pronto.tv/ Tel: +47 9801 3356 Computers are like air conditioners. They stop working when you open Windows.